Disclaimer: I, in absolutely no ways, own anything concerning Harry Potter or Sonic Underground. This is simply a fanfic written for the fun of it, Harry Potter and all rights belong to J.K. Rowling while Sonic Underground belongs to DiC Entertainment and Sega. I do however own my original characters such as Sayo who is in no way related to the Digimon World Dawn/Dusk character with the same name. I simply chose the name Sayo because I liked it.

Just to alert you before starting; Hogwarts and the whole Wizarding World is on Mobius but like in the actual series it keeps itself hidden (due to Robotnik taking over.)

Chapter One:

Five Years and a Birthday

* Five years ago…*

Panting hard from running as fast as she could from everything the small figure slowed down once she was a good distance from the burning building and the charred figure that remained of one of her parents. It was an electrical fire she overheard one of the firefighters said as she fled. With the smoke and image far behind her the small child began wondering what was she going to do; she was now with no home and no grown ups to look after her, she wasn't going to a orphanage was she? She didn't want to be dropped in an orphanage! Looking around for anything or anyone the girl noticed a particularly large Mobiusain canine heading down one alleyway. 'Maybe it'll be okay with him?' She was uncertain, the canine was bigger than any other animal-like Mobiusain she ever saw but at the same time wonder if he'll be enough to keep her from the orphanage. Glancing behind her one last time the girl broke into a run to catch up with the stranger and slid her hand into his. "Hey! What are you doing?" The canine looked down to see the frighten face of a small human girl looking up at him in an almost pleading manner. It wasn't that surprising to see humans but he thought the larger ones kept the small ones near. "Get going you!" He turned her around and nudged her to go back before she pointed at something over the buildings. "What?" He looked to notice smoke where the child pointed at in pure confusion. "…I don't get it," the canine scratched the back of his head before finally shrugging it off. "Aw well, Sleet would know something. Come on," The child instantly followed him hoping that this Sleet would be easier to get along with. She was dead wrong…

*Further down the alley*

"Dingo what is that?" A wolf like Mobiusain narrowed his eyes at the small figure that was right behind his partner. "Er…a kid? I thought you'd know that Sleet," The wolf facepalmed as she looked back and forth wondering if this was normal. "I know that you flea paradise! What I want to know is why she is with you?" While the canine explained she just simply came out of no where while pointing at smoke, the Mobiusain human looked down as she wonder if whether or not she made a good choice in following the first one in the beginning. Still she was here now and there was no going back, like she has anything to go back to. Only when he was done insulting his partner (who did not catch a single one) did the wolf studied the girl before an idea hit him. "Excuse us for a moment child," She looked up in surprise at his sudden change in behavior as the wolf dragged the dingo with him out of hearing range. Curiosity clawed at her in the stomach while anxiety tried to devour her as she waited for them to return. 'They would return, won't they?' She kept herself from crying as she remembers how it bothered her mommy so much. Shortly afterwards the duo reappeared with Sleet motioning her over. "What is your name child?" The human girl blinked in surprise and tried to answer but both the fear from seeing the burned body and running combined with the recent anxiety kept the words from leaving. "Hmm no matter. You will be known as Sayo from now on," Nodding to show she understands Sayo followed the two into a scorpion themed aircraft and into her new life.

Sayo opened her eyes on the fifth day of her new life with Sleet and Dingo who explained to her they were freelanced bounty hunters and that she will have to listen to them, specifically Sleet, if the child wanted to stay. Curious, she rolled over to face the walls inside the aircraft and pretend to still be asleep as they began speaking once again. "Is she still asleep?" Sleet asked as Dingo looked to where she was; Sayo was grateful it was Dingo due to Sleet having to drive the aircraft and the wolf would have caught her act in a heartbeat. "Nope! Sound asleep," The larger of the two said. "Good. We need her to absolutely trust us as we train her," Train? She kept as still as possible. "I don't get it Sleet, you was against having a kid around so why the sudden change in heart?" A slap and sigh told her the wolf planted his hand to his head once again. "Because you oaf imagine it if we had someone who would work for us free of charge; more jobs done, more pay and she would never even think of betraying us! It'll go all the way up to when we retire and you serve me on hand and feet as she'll continue working to bring more money," Sayo tuned them out as Dingo commented on Sleet being smart once again. 'So I'm just simply being used?' she thought sorrowfully. Curling up in a ball she laid there for the remainder of the ride up to the two fell asleep before she finally did herself.

*Present time*

Sayo grimaced as she hurried her pace with her books in hand. Once again something weird happened around her; this time the rude bookstore owner had canaries erupt from the books behind him, directly out of the pages and attacked him all the while he suddenly gained frog like traits such as eyes and tongue. 'I just hope Sleet doesn't find out. Dingo's alright, he'll laugh but Sleet will get suspicious.' The child instantly climbed into the currently empty aircraft and sat in the far corner with her new books in hand. "What they don't know won't hurt me," She shrugged as she opened the first one and began at once. Fortunately for her they where collecting the reward from their last work which means she would have at least an hour to herself and the book before she would hide them under her mattress until she's certain they didn't know she went to get books and gave an old rat Mobiusain an experience out of an Alfred Hitchcock movie. Just before finishing the seventh chapter she heard Sleet's voice signaling his and Dingo's return. 'Shoot!' The child grabbed the three books and stuffed them under her mattress while grabbing an older favorite of hers, pretending to have been reading that instead. "Still don't see how those canaries got there," Dingo muttered as the entrance opened and the two canines came in. "Sayo, get the books out from under your mattress," the wolf huffed as he went to take control of the aircraft. 'I'm not getting into trouble? Hallelujah!' "We'll talk about this later," The girl kept her lips purse together to keep a groan from leaving; this will mean longer time training and practice. Since there was nothing that could be done she turned to Dingo who was playing video games again. "Are we going anywhere specific?" The large canine nodded at her. "Yep, Dr. Robotnik himself called us!" "…We're talking about the same one who rules over Mobius right?" she blinked in surprise; she never recalled them being called by such a major figure. "Do you know anyone else?" Sleet's voice rang from the front of the aircraft. "Making sure," She called back to one of her two caretakers before resuming in reading her new book.

It took them a while before finally reaching Robotropolis as Sleet landed the aircraft and motioned for Sayo to come over real quick. "Remember, none of that suspicious activity of yours. Keep yourself in check, he can have us all roboticized in a heartbeat. I'm only bringing you along so as to make sure Dingo doesn't say anything too stupid," Silently thinking to herself she couldn't help it, Sayo instantly followed him with Dingo beside her on their way to meet Robotnik. "A child? A CHILD? What sort of nonsense is this?" The large man demanded as they came in. "I wanted professionals to deal with the Freedom Fighter's secret weapon! Not some infant who could barely walk!" 'Well look who's talking fatty!' she thought to herself before pushing down the anger she felt; the last thing they need was to be turned into robots because she somehow gave Robotnik a piggy tail without even touching the guy. "I assure you sire she is a prodigy and you don't have to even pay," Robotnik interrupted. "Of course I am not going to pay some kid!" He slammed his fist down, making Sayo think of a temper tantrum. "Of course not sir! It's just that Sayo has been taught since she could begin speaking on how to live as a bounty hunter. Don't worry; she'll be entirely out of your hair," 'Thanks…' She thought to herself. It wasn't something new; she's known and accepted it since she overheard them years ago, besides for as far as bounty hunters go her caretakers where alright and treated her better than she ever remembered her own parents had … which made it all the more harder to keep from giving him that piggy tail when he began firing lasers on them after Sleet tried to tell him he and Dingo worked independently. 'Work on blue blur now, piggy tail later.' She thought as the wolf assured the tyrant it would be destroyed before he began examining the images caught on camera as said fat man walked out for whatever reason Sayo didn't care for; instead she replayed the scene with the bookstore owner, now it was funny since she more or less isn't in severe trouble. 'Plus that one kid was laughing like no tomorrow.' She recalled seeing another human child around her age having to hold onto the edge of the counter to keep himself up as the rat Mobiusain was screaming in terror being chased by canaries as his tongue grew longer.

"Freeze frame and enlarge," Sleet's voice snapped her out of her thoughts and look back up at the screen. "How can anything move that fast?" The wolf muttered before Dingo commented on how it slowed down for a moment when it hit Robotnik's shield. 'How he noticed that the world will never know!' Sayo thought; she cared for them and all but Dingo was pretty hopeless most of the time. "HEDGEHOG?" The fat man bellowed before demanding them to leave instantly. "I don't get it, didn't he hired us?" Dingo asked before Sleet turned his attention to Sayo. "Sneak back over there and see what you can hear," Said ten year old whipped her head at her caretaker in shock. "What!" "Go!" Knowing he meant it she slinked back and opened up the air vent next to the door so she could crawl in. 'I hate them sometimes…' Fine, she gets caught she's making sure at least Sleet will be dragged down with her. She watched carefully as Robotnik was looking at a hologram which showed a reptilian speaking to him of a prophecy. "They're still out there! Then I'm declaring war on the Resistance!" The large tyrant bellowed as Sayo slink back out of the vent, she needed to hurry so she could get away from the hall and go back to the aircraft; she has a funny feeling they didn't wait on her. "There you are!" Then again she could be wrong as the wolf motioned her to hurry over. "Not now, he should be coming out soon," she whispered in a hush manner to them. Shortly after they heard their new boss's footsteps as the smarter of her two caretakers pulled her along with him while motioning for Dingo to follow before they turned sharply down another. "Shush!" He snapped at Dingo who was about to ask what Sleet was doing as they heard Robotnik coming around to where they were. "Where were you fools? Get over here!" Sayo motioned for the brute of the two who brought her in to be quiet. "I'll explain later," she mouthed at him, a nod showed her he (thankfully) got it. While Robotnik and Sleet where waiting for the computer to reveal any identification on the hedgehogs Sayo explained to Dingo that the wolf was wanting to make sure Robotnik won't be suspicious of them spying on him. "Well? What are you waiting for? Get that hedgehog!" The tyrant yelled as Sleet grabbed Dingo from his back fur and dragged the canine as their 'adopted' human child followed quickly.

"Remember, stay in the aircraft. If I find out you wondered off you will be begging for it to be Robotnik you would have to deal with and not me," Sayo nodded as she continued reading her book, often whenever they had to bring the child with them to a job Sleet would make sure to remind her to stay out of their way. 'Though quite honestly I don't think he would do anything; he would be stuck with Dingo.' She noticed he was stuck on a level before taking the controller out of his hand and easily got through it. "How did you?" The orange canine whipped his head to the child in surprised as she continued reading. "I've beaten it already when you guys where doing another job long time ago," "THEN THOSE SCORES WERE YOURS!" She shrugged apologetically. "I got bored," "Will you two shut up? Dingo, come on!" Sleet called as they exit out of the aircraft, leaving Sayo alone. With a stretch she gotten up, having just finished the first of her new books and wanted to rest her eyes from reading before jumping on the next one. 'Dingo probably wouldn't be too happy if I jump straight back on his games and delete any progress he made. Sleet made it clear last time not to touch anything… Guess I'll just lie down for a while.' Sayo flopped back on her mattress and shut her eyes, letting pleasant dreams take over. 'I'll tell them about Robotnik later … when they get back.' She then fell asleep; having dreams of silvery animals, castles that touch the skies, and streams of red, green, blue and, yellow as a large serpent with piercing yellow-last-thing-you'll-see eyes slithering before a dragon gave a proud roar. And she was in the middle of it all with four other figures. Suddenly, Sayo felt something shaking her; tearing her from hearing the dragon or seeing the eyes in streaks of four gleaming colors and all but took the castle away from her mind. Opening her own earthy green to see the dingo Mobiusain looking over her. "Hey, time to wake up you," With a yawn she sat up and stretch as she glanced around. "Just help yourself to whatever we got, I need to catch up with Sleet," Nodding to show she heard, Sayo gave it a moment to wipe away any sleep from her eyes before getting up and grabbed a slice of cold pizza from the portable fridge. 'Oh yeah, it's my birthday.' She was officially eleven years old and hungry as she continue to eat before hearing a scratch outside the aircraft. "Dingo, please don't tell me you forgot how to work the aircraft!" She groaned before opening it for to have not Dingo but a small feathered creature come in. "What the?" she whipped around to see a brown owl with a letter in its beak sitting on her mattress. "What?" She stared at the tiny bird as it held its head up and out as though it wanted her to take the letter.

Pacing around she re-read the letter wondering what to do. 'Is this some sort of joke? Then again weird things do happen but is there any proof I did that?' The small owl clicked its beak as it wanted to hurry up and leave but she had yet to open the door on this strange device to allow it. After a moments thought she turned to the supposed to be nocturnal animal and sat down at eye level. "Can you bring to whoever sent this a letter I write to them?" The bird nibbled her fingers tenderly as to say 'yes'. "Kay, one moment," She grabbed some blank paper that had came from the front of one of the more older books and her pen before writing neatly, only pausing once to fold the paper and write down the address that was on the letter given to her just to play it safe. "Here you go," She handed it to the bird and opened the door of the aircraft as it took flight. 'Wonder how Sleet and Dingo are going to react…' A few moments later there was a knock on the door which had the girl looked up. Standing outside was perhaps the sternest woman Sayo had ever seen while the thought she shouldn't be cross come into the child's mind. "Good evening Miss Sayo, is it possible for us to come in?" Nodding she stepped aside to allow the elder woman to come in with a familiar face behind her and into Sayo's range of view; the same boy at the bookstore. "Where are your caretakers?" "They have yet to return. Is there anything I can get you?" With a polite 'no' the woman raised up a long, decorated stick and with a flick of her wrist, a tray with three cups and one teapot appeared. "How'd you do that?" The boy jumped in surprise, vocalizing what they both thought. "Magic. What you two will be taught," They looked at one another before taking the cups that floated out in front of them and took a sip. "Now then, Mr. Allen Smith this is Miss Sayo, you two would both be first years at the school and come from Muggle families; meaning your parents are both non-magic folks," The two looked at each other once again before Allen spoke up. "So what? Where are your parents anyways?" Sayo waited for until she was done with another sip before answering. "My birth parents died about five years ago in a fire," Cringing, the boy gave a quick sorry before focusing more on his own drink than before. "So… what do your caretakers do?" "They're bounty hunters ... working for Dr. Robotnik now," The two looked at the child, Allen more out of pure terror. "For Robotnik!" "Just now! Hey, he shot lasers at them!" He gave her a sympathetic look; he can just imagine what being so close to the tyrant is like. At that moment the two bounty hunters had return and it was obvious the last thing Sleet wanted to see was more people suddenly appearing after failing to catch the Oracle and the hedgehogs.

"Sayo what is going on?" The wolf demanded to know from the child. "Well, Mrs. …" she paused; it occurred to her she did not know the woman's name. "Professor McGonagall. Incase you did not realize it, Miss Sayo here has extraordinary abilities; I came from a school where we help them in learning how to use and control it," Both of the children and Dingo edged away from the elderly human and the wolf. "And what do you mean by 'extraordinary abilities' madam?" "Magic; Miss Sayo is a witch and Mr. Smith is a wizard. If you need proof," she conjured up two other cups for the canines, already filled with tea. "Whoa, you're gonna learn how to do that?" Dingo turned to the two children. "And more," Professor McGonagall replied. "Alright, but what about in terms of paying for this? Also how long will she be gone?" 'Figures. Money first, everything else later.' Sayo took another sip. "Not to forget to mention who is in charge of all this?" The wolf continued. "I am the Headmistress, since they came from Muggle families," ("Non-magic families" Sayo told her confused caretakers) "She and Mr. Smith will be given wizarding money every year which should be more than enough assuming they handle it wisely," "Oh really?" Sayo had no doubt both Allen and McGonagall saw how Sleet's eyes gleamed at the mention of getting money. "Also she will be going there for seven years and will return on holidays and during summer vacation," "Sounds like a school," Everyone looked at Dingo as Sleet smacked himself in the face once again. "It is a school, you idiot! She just said that!" "Are they always like this?" Allen mouthed to her. Sayo could only nod while covering her own face with her hands; though unlike Sleet she was embarrassed by the both of them.

Chapter One of my new story everyone! Don't worry I haven't forgotten Darkest Digital Saga but due to Pottermore and watching Sonic Underground I so badly wanted to make a crossover of the two. Plus Sonic Underground needs more love. Well I hope you would like my new story.