So, here's a crossover of the Mortal Instruments (after city of glass) and Young Justice (During Season 1!) Enjoy!:D

Paige woke up early as usual. Weak yellow light filtered through thee small window above her bed. Yawning she sat up, rubbing her eyes groggily, wiling herself to be alert. She swung herself over the side of the bed, standing up and stretching up her arms to the sky.

She stumbled into the bathroom getting ready with a bit of a rush; she didn't want to be late for her first day of school after all. Slowing down slightly, she stopped to examine herself in the mirror. She tugged at her skirt slightly, she didn't like wearing uniforms that much. She preferred to choose her own style, even when it came to gear for shadowhunting. She sighed quietly, she looked like such a prep, but there was nothing to be done.

Taking a brush, Paige ran it through her medium length brown hair. Paige always liked long hair, she admired girls who could handle that much hair, they reminded her of goddesses. Unfortunately, long hair was very unpractical for a Shadowhunter; at least that's what her mother had always nagged her. Paige wished she could be like Isabelle Lightwood, a great fighter even with long hair.

Short hair, long hair, it hardly mattered. The first and maybe only thing people ever noticed about Paige Fairchild were her eyes, bright and clear, the bluest blue imaginable. Her skin was tanned slightly; she spent a lot of time in the sun. Her features dainty and her cheeks flushed slightly. Paige was also of average height. In a crowd she didn't stand out too much, she didn't want to either, but those eyes…So blue, they were pesky and attracted attention, unwanted attention especially with her new mission. She put a glamour over the color, dulling the intensity.

Paige smiled at herself in the mirror, feeling a slight swell of happiness that her reflection portrayed her as just an average girl. Her uniform covered her runes and bruises, and with the glamour over her eyes she blended perfectly. No one would spare her a second glance.

No one at all.

In the Shadowhunter world, she was almost never noticed, in the mundane world people noticed her, even if it was just for her eyes. Maybe she didn't want to blend after all, Paige didn't get that much attention to begin with, and the few glances she got when out in the public was one of the few things that fed her self-confidence. Maybe she didn't want to blend.

No, stop being selfish. It doesn't matter if people notice you or not, you have a job, and this is what you have to do. Paige quickly reassured herself, shaking her head.

"Paige! Time to go, I don't want you to be late!" Her mother, Ava, called up from down stairs.

"I'm coming!" Paige called down, poking her head out of the bathroom door before bolting out and grabbing her bag. She skid down the hall and stairs, meeting her mother in front of the Institute's large mahogany doors.

Her mother smiled warmly, resting a hand on Paige's shoulder, "you look great honey," she sighed looking down, "are you sure you want to go through with this? It's an important investigation and all, but it could get dangerous…I still don't know how you talked your father into giving you this job in the first place."

Paige rolled her eyes slightly, shrugging off her mother's hand. They'd been through the same conversation before, multiple times, still she could not convince her mother to have some faith, "Mom, I'll be fine, trust me." She gave her a weak half smile before sliding out the door, "I better go, see you tonight!" She called over her shoulder before jogging off, not wanting to risk her mother deciding last minute to keep her home.

Paige navigated her way through Gotham City with ease, having lived there her whole life. Paige's family had always run Gotham's institute, it was always a very interesting city to be a shadow hunter, it was also a place where Shadowhunters had to be a lot more secretive and swift.

The place always seemed to be crawling with superheroes, though almost every major city was. Superheroes, they were always silly in Paige's mind. They were always oblivious to Downworlders and Shadowhunters, not to mention demons. Though the occasional demon made itself very public, this was when the Justice league would take care of it.

Shadowhunters were the law among Downworlders, and they kept the mundies and superheroes safe from demons and humanity's doom. The heroes, protected mundies from idiotic villains and aliens wanting world domination or something .

It seemed unfair to Paige, that the Heroes get the glory for saving mankind every day, while Shadowhunters die in the hundreds doing the same thing without a notice. Shadowhunters were never for the public to know about anyways, they worked in secret, against an enemy that humankind was not even aware of. This was the way it was meant to be, Shadowhunters do it because they were born to, and heroes do it for different reason entirely, her father told her once when she was very young.

Paige shook her head and gazed up at Gotham Academy. "This is it." She mumbled under her breath, looking around the courtyard and scattered groups of students. She adjusted her pack, hearing the faint sound of two deactivated seraph blades clinking into each other. She flinched, hoping no one would notice.

Entering the campus Paige looked around nervously, flipping her bangs out of her face to see more clearly.

"Nephilim, I thought your kind was home schooled." Paige jumped turning to see a young boy with narrowed eyes and a wicked grin on his face. She stared at him, trying to see past his glamour, noticing cat ears peeking out of his messy blonde hair.

She glared at him lowering her voice, "I wouldn't think a warlock would need to attend school either," She retorted dryly, crossing her arms, "am I that obvious?"

He shrugged slightly, "I just have a talent I guess, though your glamour is rather heavy…Who put it on?"

"Magnus Bane," Paige blurted, not even giving it a second thought.

The warlock nodded, raking a hand through his hair, "Figures," he paused slightly, flashing a lopsided smile at a passing blonde girl who snorted before trotting off, "so what brings you to Gotham Academy? Clave business, I presume."

Paige scoffed, "Like I'd tell a Downworlder, I could be asking why you're here."

The boy lifted his hands in a surrender position, "I'm not working against you, Shadowhunter. I'm guessing we're probably here for the same reason, hmm?"

"The missing students…" Paige mumbled, looking up and meeting his eyes, "They're most likely just vampires, what interest would a warlock have in that?"

"Vampires? Silly Shadowhunter, the Gotham vampire clan are no fools, they wouldn't attract attention to themselves, especially in this city."

"Then what is it? Do you know?" Paige furrowed her brows in irritation, the warlock giving her a lazy grin, "and why are you so interested?" She asked, stepping forward.

The warlock laughed, stepping back and turning, "I can't tell you all my secrets Shadowhunter, or you might beat me." He winked before disappearing into a crowd.

Beat you to what? Before the words could leave her lips the bell rung and she was left staring at the passing group of students.

XXXXXXXXXXXX

Surprisingly the day was dull, getting thrown off by the warlock, Paige was a bit glum the whole day. Scowling at the ground replaying the conversation over and over in her head again, trying to figure out what he meant.

Reading her expression most people stayed clear of her. Damn Downworlders interfering with my investigation.

She tried to get some info on the missing students to no avail, kids were still pretty icy on the subject, and she didn't know anyone well enough to ask the tough questions.

Feeling defeated Paige exited the school, walking around the back to make her way to café downtown run by a Filipino werewolf. She pulled out her cell sending a quick text to her mother that she'd be home later before getting cornered by a large boy with dull silver hair. She stared into the boy's glassy black eyes, no whites to be seen, demon…The warlock was right.

"So the clave sent a little spy to investigate us did they? Such a cute little thing, what damage do they expect you to do?" The demon growled, a sinister grin spreading across its face, it took a step closer, raising a hand that ended into jagged claws.

Paige attempted to keep her cool, reaching into her pack and grabbing her seraph blade just as the demon scratched at her face, she dodged to the right, taking the hit to the shoulder leaving long tears into her shirt.

Once she had a solid grip on the hilt she pulled out the short and blunt object, "Cassie-" Before she could finish saying the blades name a figure jumped out from the shadows, kicking the demon upside the head.

"Leave her alone!" The figure shouted, the voice was male, Paige half expected it to be the Warlock she met earlier in the day, but it wasn't. Instead it was a boy maybe half an inch shorter than her with spiky black hair and blue eyes, dressed in the school uniform.

The boy, seeing the demon as a human due to its glamour, moved into a fighting position, "What's your problem, hitting a girl?"

No no no no no, stupid mundies….He's going to get himself killed. To Paige's surprise, the boy landed another blow to the demon, making it stagger back with a sneer, "Stop it!" Paige yelled before the Demon could attack, locking eyes with its vicious animal gaze. If the demon was smart, it would leave, killing a human boy and a Shadowhunter would attract too much attention to…Whatever it was doing. Hopefully, it would see this and leave them alone.

The demon stood up straight, shooting both her and the boy a glare, "You win, this time." It said, it's gaze lingering on Paige as it backed away.

Once the demon was out of sight the boy ran to Paige, examining her shoulder, "Are you okay?" He asked, "those are some pretty nasty gashes you got there."

Paige inhaled sharply as he prodded the wound, "I'm fine, it would help if you didn't touch it though..." She murmured backing up and grabbing her bag off the ground, sliding in her seraph blade as discreetly as possible, "Who was that guy?" She asked, hoping to find out the demons fake identity, it might come in handy.

"Kind of the schools bad boy, I don't know how he stays here…He manages somehow, I'm pretty sure he's part of some gang," The boy answered, looking at the bag Paige was zipping up, "I could walk you to the school nurse if you want, in case that guy comes back…What did he want with you anyways?"

Paige shrugged, grimacing as pain shot up her shoulder. If only she could ditch the boy she could use a iratze to heal the gash. She also wondered why this boy was so skilled at fighting. It was strange…Especially since he was a mundie up against a demon, weaponless. "I'm fine thanks; I just need to get home."

"I could walk you home," The boy offered, "And carry your bag, I could wrap your wound with something too if you'd like."

"I'm. Fine." Paige replied turning, "thanks for…Saving me."

"C'mon, you need protection if that guy comes back…And your shoulder."

Paige highly doubted the demon would come back today, and she wouldn't need any help fighting it off, at least she thought…This boy however obviously wasn't going to give up, "I guess you could walk me home."

The boy grinned, "Cool! My names Richard Grayson, you can call me Dick."

Paige blinked at his enthusiasm before returning the smile, "My names Paige Saunders," she replied, her mother had insisted she have a fake last name, though she failed to see the logic in that. They began to walk off the campus, most of the kids had left, and the courtyard was almost completely empty. "Nice fighting skills, where'd you learn to fight like that?"

Richard paled slightly, stuttering for an answer, "I, uh, take martial arts."

XXXXXXXXXXXXXXXXXXXXXX

Robin's POV:

Robin noticed the new girl as soon as she entered the campus, though he had trouble keeping track of her, it seemed every time he looked her way, his gaze slipped off to somewhere else and she was gone.

He discovered he had half the same classes as her; she spent most of the time by herself staring out the window with an intense expression, it was clear something was troubling her, Robin guessed it was the school switch.

Something about the girl caught his eye though, and it wasn't because she was cute. Something about her seemed off, a strange energy seemed to come off her, as well as the fact her couldn't keep track of her.

Once school had ended he followed her around the back of campus, keeping to the shadows. When Nate, the older student, attacked her, Robin was in pure shock. He didn't even think before he jumped out and defended her. After the event he had kicked himself for not changing into costume, his identity might have been blown, but she seemed to buy his weak lie as he walked her home.

After a couple minutes Paige looked around, "You can just walk me downtown; my mom's picking me up at a café there."

He nodded following her lead to a small café called Kapamilya; he'd never noticed it before. Gotham was a big city though, so it wasn't that much of a surprise.

"Thanks, for everything." Paige said a bit meekly, backing into the café.

Robin grinned, "Happy to help!" He said before waving and turning, "see you at school tomorrow!" And he left, striding down the street. Robin was in such a daze, he almost didn't notice he was still carrying her textbooks. He turned back to find the café again, but for some reason no matter how hard he looked he couldn't find it.

Weird…I could of sworn it was just down the street…He shrugged, figuring he could just return them tomorrow.

So, first chapter! What do you think? I'm planning on putting in plenty of cameo appearances of Mortal Instruments characters and I'll be throwing more of Young Justice into the mix for sure next chapter! Any suggestions would be greatly appreciated!

Requests for any characters to be thrown in the mix I will accept! Any mortal instrument character who isn't dead, any season 1 Young Justice character, and even though it isn't mentioned….I'll throw in teen titans characters if it's requested!:D

Please Review!