Ok guys, this story is a cross over between Marvel Comics and Young Justice. I might turn it into a Superboy love story, reviews can help me decide. Anyways, my OC, Mio, she's awesome, then again, she's a Howlett, how can she not be?

In the beginning, there was blood.

The team waited patiently as Batman talked on the communicator, wanting to know exactly why they had been called. They were curious because, not only was Batman there, but so was Black Canary, Red Tornado, Green Arrow, Martian Manhunter, Aquaman, Flash, and Superman.

Conner couldn't help but steal glances at the man of steel, saddened by the fact that Superman didn't even glance at him.

"I understand, but she'll come around eventually." Batman said into the link. "Yes, I've dealt with people like her before."

To the teams surprise, Batman actually smirked, "No, just you, but that in itself is quite enough."

Robin frowned, trying to figure out who his mentor would actually laugh with, and coming up with no suspects.

"She can decide for herself, but I'll be urging her to accept." Batman paused, "Of course that's the right entrance, do you see any other mountains with a secret entrance around here?"

Kid Flash's eyes widened, and he turned to robin, "Did Bats just make a joke?"

Robin's eyes widened too, "Yeah, I think so."

Superboy spoke up, "The person on the other end just threatened Batman, but I'm pretty sure they won't really cut out his diaphragm."

Robin's eyes suddenly lit up, "Oh, I know who he's talking to."

Batman ended his conversation, looking up at the team, "To answer any questions, that was a certain friend of mine, who should be here momentarily. He'll be bringing a guest with him, and she might take some… adjusting too."

"We're getting a new team mate?" Megan asked, happy at this news.

"And a girl at that." Artemis smirked at Wally, "Get ready boys, girl hostile take over time."

"Please." Wally snorted, "Whoever she is, she's bound to have more social skill than you."

"Meaning?" Artemis asked.

"Meaning she'll fall for me in no time." Wally summed up.

Robin suddenly burst into laughter, his signature cackle to be precise. Everyone stared at him, until Wally asked, "Dude, what is so funny?"

Robin took a deep breath, and finally said, "Wally, unless you want to be decapitated, you'll keep your flirting to yourself, if this new team mate is who I think it is."

He turned towards Batman, "Is it?"

"Yes, but she's not going to be your team mate." The Dark Knight answered. "She's meant to be an instructor for Conner."

Conner looked up, "What?"

Black Canary nodded, "You're progress is outstanding, but I'm afraid in order for you to really push your limits, you need a sparing partner you can actually hit full force."

"Without killing them." Batman finished.

"But I'm doing fine-" Conner started.

"But you can always do better." Black Canary finished. "This new girl will help you progress, and in time, I think you'll come to respect her, maybe even like her.

Robin snorted, "That's likely."

Suddenly, the doors opened, and in walked a man who looked to be in his thirties, with a teenage girl at his right side, and a toddler holding onto the teenager's hand for dear life, crossing her legs so hard, Robin knew he couldn't get into that position without pulling a muscle.

The teenager and the man were in a heated argument. "You said she went before she left."

"I said I told her to go, you can't blame me for her stupidity." The teenager retorted.

Conner couldn't believe his eyes, this so called instructor was two heads smaller than him. She had a very thin figure, hardly any upper body strength. She had this air about her, that said 'I'm better than you' and a look on her face that screamed, 'I don't care.' She had the blackest hair he had ever seen, and it was obviously natural. Her eyes were a piercing blue, they gave his a run for their money. Her skin marked her as an oriental. Either Chinese, or Japanese, he couldn't decide.

She wore a long sleeved, zip up black shirt, the zipper pulled down to about an inch under her collar bone. Black pants adorned her legs, and black combat boots completed her simple outfit. She didn't look a like a Goth, she didn't have on heavy eyeliner, or any other make up on.

Her eyes scanned the room, and landed on Robin, who walked over to her, "Mio, long time, no see."

"Not long enough." She said, showing her obvious disdain for the resident boy wonder.

He chuckled, "Still as warm and welcoming as ever."

The toddler suddenly spoke up, "Mio!"

"Oh right." Mio said, she looked at Robin, "Bathroom?"

"Down the hall, third door on the left." He said, pointing.

The toddler took off, not bothering to wait for anyone to go with her.

Her eyes traveled again as the man started talking to Batman, and they landed on Conner. She didn't bother hiding her obvious disdain for him as well, "This is my crash course student?"

Conner frowned, and walked over to her, holding out my hand, "Conner."

She looked at his hand with disinterest, and then back up at him, "We've got a lot of work to do."

Conner dropped his hand and glared at her, and she wasn't even fazed. Black Canary came over quickly, "Well, Mio, it's an honor to finally meet you."

She shrugged, "Eh, like wise I guess. Who, are you again?"

Black Canary faltered, and then smiled again, "Black Canary." She stuck out her hand to shake, like I had.

The girl sighed, closing her eyes for a moment, and then looking at Canary in an odd way, "Are you asking my to break your arm, flip you over my shoulder, or slice through the vital vein in your wrist?"

"None of the above." Black Canary said, dropping her hand. Robin quickly stepped in.

"Oh yeah, forgot the pleasantries myself." He gave a short bow, folding his hands together. Mio nodded, and then did the same.

Conner raised an eyebrow, and Robin quickly explained, "She's Japanese, not that great with American customs I might add."

Black Canary raised an eyebrow, "You were born in Japan?"

Mio shrugged, "Ten years in Japan, five in America, and frankly everything here disgusts me."

Megan looked taken back, "Everything?"

"What you people call food, I call vaguely edible substances drowned in grease. Known to you as pizza, bacon, and burgers." She explained, "What you call TV, I call subtle brainwashing. What you call bosses, I call know it all's who can't even do your jobs."

Artemis smirked, "Oh yeah, she's gonna fight in great."

Wally zoomed next to Mio, about to use some stupid pick up line, but before he could open his mouth, she quickly grabbed his shoulder, jabbing her thumb into the skin as hard as she could.

He suddenly collapsed, twitching and groaning. Robin cackled again, "I warned you KF!"

Mio looked like she was trying to remember something, "Isn't he the fastest kid alive? Pathetic."

Batman turned to the team, "Enough talk, Conner, Mio, time to spar."

Megan spoke up, "Shouldn't Mio get settled in first?"

Mio snorted, "Look Martian, I'm not staying here."

Megan frowned, "But I thought you were going to be Conner's instructor."

"If I feel like it." She said, "We spar one round, if I decide he's actually worth my time, then I'll be his instructor, however, I won't be staying here. I'll get an apartment in the city if he actually manages to pass this little test."

Robin frowned, "You know he can't beat you."

Conner growled at Robin as he and Mio stepped into the middle of the room and Black Canary started the computer.

"He doesn't have to." Mio said, taking a fighting stance, and Conner followed suit. "He only has to intrigue me."

"Wait!" came a little voice, as the toddler ran back into the room. She ran to stand by the man who came with Mio. "OK, fight!"

Mio didn't need to be told twice, she leapt at Conner, who dodged quickly. She immediately regained her stance. "You're fairly fast, not a total weakling after all."

Conner growled, and lunged at her, throwing a series of punches, which she easily weaved in and out of, smirking the whole time.

Conner caught a brief look of her eyes while she moved, and what he saw unnerved him. He could see, she was loving every minute of this fight, every move she made, every breath she took, was that of an animal.

She attacked him with such curiosity, Conner stumbled back. Her punches and kicks didn't hurt him, he was the boy of steel, after all. They just shocked him. She twisted out is his desperate attempts to punch her, kick her, grab her, or trip her. She suddenly jumped up, planting a foot down on each of his shoulders, and shoved off, flipping through the air, and landing without a sound, even Robin was impressed.

She wasn't smirking anymore, she was frowning. He could still see the monster no, the animal in her eyes, wanting to fight, wanting to kill, wanting to kill him. He was a little scared, but he wouldn't let it show. Not in front of the team, and not in front of Superman.

"You're wasting my time!" The girl snapped. Conner lunged at him again, and she jumped over him, flipping and landing perfectly again.

"Stop trying to hit me!" She snapped.

Conner was furious, "Isn't that the whole point?"

"You're not listening!" She snapped, dodging more attacks, "Stop trying to hit me, and just focus on dodging me, idiot!"

He growled, but did as she said, dodging as much as he could, and silently taking the ones he couldn't dodge. They went on like that for twenty three minutes, until Conner saw an opening. He punched her right in the chest as hard as he could, sending her flying into the cave wall, and halfway through it.

"Conner!" Megan shouted, horrified. Then he realized, he had actually done that. No one could have survived that. Wally and artemis were immediately a the far wall, pulling the girl's motionless body out of the hole her body had made.

His heart stopped for a moment, he didn't hear a heart beat.

Suddenly, the girl shoved Wally, who had been trying to check her pulse, away, and got on her hands on knees, coughing up blood and trying to stand.

Artemis tried to get her to sit down, but she was pushed away too as the girl stood up, her right leg at an odd angle. The girl jerked her head to the side, and everyone heard a sickening crackle. Conner looked towards the man he assumed was her father, they looked enough alike, to see him covering the toddler's eyes.

He didn't look concerned for the girl, just smiling at her as she jerked her leg to the side. Conner winced, hearing the bone snap back into place. She cracker her knuckles, and slowly turned her head to the side, a spit a good amount of blood on the floor.

She turned back to Conner, her tongue licking the little bit of blood from her lips. Her own blood. If her eyes were scary before, they were terrifying now. The animal was enraged, ready to kill, to pounce.

She calmly walked over, slowly, with a purpose. As she walked, a loud *snikt* could be heard, as a long, thin knife appeared in each hand, gleaming dangerously.

As she got loser, she attacked, slicing at Conner quickly and mercilessly. Conner jumped back, trying to dodge, but soon found he couldn't keep up with her at this speed. She was quickly able to cut him across his shoulder, and she used his short lived surprise to trip him, and pin him, both knives at his throat, in the position of an X.

No one moved, no one spoke for the longest time, until they heard faint clapping. They both looked over to see Black Canary standing there, clapping slowly and softly.

"Congratulations." She said, "I've always wanted to see the legendary Hell Hound in action."

The girl stood up, and that was when Conner saw the knives weren't being held by her, but attached to her. They were sticking out of her skin, slicing right through each middle finger knuckle, a faint line of blood trailing from each. He watched as the knives went back into her hands, and the slow motion of sliding through the hand and into the arm. The wounds that they had made coming out closed up, and she wiped away the blood with the same bored expression she had when she walked in, the animal was no where to be seen, but he knew it was still there.

He slowly stood up, not sure what had just happened.

"Thank you for the compliment." Mio, or apparently, Hell Hound said, heading out of the sparing area and over to the man and toddler. The toddler tried to run over to Mio, but the man held her back as Mio hesitated on the edge of the sparing area.

She took in a breath, and said without looking over her shoulder, "Congratulations Superboy, you've intrigued me." She hesitated as he stood there, "Surprisingly."

She walked off the edge of the circle, and the toddler jumped at her leg, hugging it, "Dat was amazing Mio! You cwushed him!"

The girl kept walking with the toddler latched onto her thigh, "Let's go Logan."

The man, Logan, nodded, and turned to Black Canary, "She'll be back the day after tomorrow, gotta get settled in to her apartment."

"Will you be with her?" Black Canary asked.

"Nope, I'm heading back to New York." He said, "Lovette will be staying with her."

The toddler smiled, "Yay," while Mio groaned to herself.

"You're just going to let her live alone?" Super man asked, speaking up for the first time. He didn't know Logan that well, only met him once before, but he already didn't care for him much, maybe it was the fact he killed villains, or his attitude, but either way it was all the same. "She's just a kid Logan, she can't live by herself."

"She can take care of herself well enough." Logan said, fixing the kryptonian in his signature look, "If she's good at one thing, it's survival."

"But your leaving Lovette with her." Superman argued, "That is child neglect."

Logan snorted, "She's fifteen years old, you think she doesn't know how to take care of a three year old?"

"Well I'm just saying-"

"Shut up!" Mio exclaimed. "Look big blue boy scout, I'm tired, I just drove all the way here from New York cause Logan didn't wanna take the X-jet, technically, your kid just killed me, and I really wanna go to sleep. I'm not a child, unless you count my age, which you shouldn't. If I can fight my way through an army, I can take care of a toddler for a few freaking weeks! Which is probably the longest I'll be here, so get your thong out of a knot and shove off!"

With that, the girl walked out with the toddler in tow, followed quickly by Logan. Wally was the first one to break the silence that settled over the cave, "Well, I'm confused."