Half and Half

Disclaimer: I do not own The Mortal Instruments or PJO

Chapter 1:

The night is a frightful thing. The most evil and sinister beings tend to stir and lurk in the shadows under the cover of darkness. The absence of light appeals to those with the evil intent of doing harm. For the Shadowhunters it was a recurring and daily fact of life. Even so, they tended to do their travel under the cover of darkness even with the threat of demons.

Percy was taking the local bus in Manhattan to go back home to his mother. She knew not to worry about him if he didn't show up, either side tracked by fighting for his life from monsters or Camp Half-Blood requiring of his services. But today was definitely a different night unlike the rest.

He was awaiting at the bus stop after a whole day of school and attending after school tutoring. The night sky was darker than usual which didn't seem to bother Percy as he maintained the nodding of his head with music blasting from his headphones.

Riptide or Anaklusmos was within reach inside a pocket within his jacket. It was uncharacteristically chilly this particular night as Percy could see the water vapor come out of his nose and mouth from the chilly and windy night.

He was situated near an alleyway, the darkness not fazing him as he was veteran of war within his own right. As he checked his wrist watch he noticed the bus was running late. Which didn't bother him all too much as he kept his head bobbing along with the music.

However, a young little girl passed him, almost as if under hypnosis not bothering to acknowledge the teenage boy waiting for the bus.

The young girl went into the dark alleyway which Percy found odd. Percy was caring and curious at the time. He held the sense of responsibility to make sure the little girl was not another amber alert, or worse another loss of life at such a young age.

Disregarding the arrival of his bus, he decided to follow the girl through the dark and smelly alleyway. The girl walked and walked under her trance until she made her way across another alleyway.

After following the girl for a few minutes, the girl broke her walk into a full fledge sprint. Percy ran after her, hoping he wasn't the reason she began running. She ran through another corner, and when Percy turned the corner, he realized he lost the girl. He turned around in a full circle looking for any hiding spots. The girl was nowhere to be seen which only further worried him.

It didn't take long for Percy to turn his attention to the loud and screeching scream that was heard further down the alleyway. Percy hoping, he could reach in her time began sprinting not worrying about getting lost in the shady part of the city.

He found the girl being surrounded by four hooded individuals with blades drawn with an unusual feint white light, he realized this was no ordinary encounter.

"What the hell are you doing?" Percy screamed as the hooded figures turned their attention to him.

"He's not mundane. He can see our weapons." A feminine voice spoke out alerting her group members.

Percy looked at the group almost a little intimidated. They looked like some cult that would sacrifice children to their radical ideals. That wasn't going to happen under his watch.

"I suggest you let the girl go." Percy said as he neared the girl slowly.

"I suggest you remove yourself. Before you get hurt." This time a male voice with charisma responded.

"I can't. You'll have to go through me." Percy said as he fetched Anaklusmos in its pen form.

When he got the pen out of his pocket the dark hooded figures couldn't help but laugh at the absurdity of the black haired teen's antics.

"You can't be serious. You're going to fight us with a pen? Pathetic." The male voice said as he began approaching Percy and the little girl.

Percy uncapped Riptide as it sprung to a three and half foot-long leaf shaped sword. With its own gold feint light of its own. The lone hooded figure stopped in his tracks as he now saw Percy wasn't playing along after all.

"Where did you get that? I've never seen it before." This time a different feminine voice responded.

"None of your business. Now are you going to let the girl go or not? That way we can get this over with." Percy responded.

The girl meanwhile watched unflinchingly at the argument going on with the Shadowhunters and the lone demigod. A sinister smile was plastered on the young girl's face.

"Move aside." The male that had walked up to Percy said.

"No." Percy said as he began closing the gap between the two.

"Jace don't. You're going to hurt him." Both the females of the group said in unison.

The one known as Jace closed the gap between himself and Percy with inhuman speed. Jace thrusted his sword toward Percy's midsection which Percy hastily blocked with Riptide. To the normal eye the fighting was a blur as the seraph blade and bronze Xiphos clashed between each other. Each parry between the two combatants caused sparks.

The little girl as Percy had called it began screeching a deafening scream as both Percy and Jace turned their attention. The demon ripped its host's body as it revealed its true form. The features were not distinguishable as the demon was pure darkness and the face of a hideous monster with red eyes.

"What the hell is that?" Percy said as he backed up.

"It wasn't a little girl as you said. It's a demon and we're known as Shadowhunters." The red-haired girl said as she dropped her hood and revealed her face.

"So, a monster?" Percy replied as he joined the group, albeit a little cautiously.

"A demon. They originate from the void." Jace said as he dropped his hood to reveal a handsome face, blonde hair, gold eyes, and a muscular physique.

"Okay… Well I don't know about you guys, but I'm not trying to die today, so let's hurry up and kill this thing." The entire group of Shadowhunters nodded and began staring the demon down.

Unlike the Shadowhunters, who were busily trying to figure the best point of attack to defeat the demon, Percy decided to use his own powers. He concentrated as he felt the water around in the atmosphere and felt the familiar tug in his gut. Water began to hastily form as a protective barrier around Percy, following him as he moved. A course of electricity was flowing around the barrier also serving as a shield against anything trying to get into Percy's guard.

"What the?" This time the other female spoke up. As she looked at Percy and the surge of water and electricity coursing around him. She was average height with black hair and brown eyes.

Percy stood his ground as he concentrated on getting more water around him. When he had sufficient water, he used his hands to control the water, and the water mirrored his hands. Two hands made of water appeared and grasped the demon from the midsection and held it in place.

"Now. Attack it!" Percy said and the Shadowhunters obliged as they maneuvered quickly and nimbly and thrusted the demon through the midsection. The demon screeched even louder at the apparent pain and damage the seraph blades seemed to cause.

The demon screeched for a few more seconds before being destroyed.

Percy was a bit tired from the excess use of his power and sat down on the brick covered alley way and the other Shadowhunters watched him as he did so.

Percy for one didn't like to be the center of attention. Even if he was the son of Poseidon, he despised that people saw him as this perfect demigod when he had his own flaws.

"What?" Percy said as he couldn't help the feeling of the awkward tension in the air.

"He has to be a shadow hunter." The red-haired girl said, but not towards Percy but to her group.

"Shadow hunters don't have those kind of powers Clary." Jace said as he began to pace up and down.

"Alec and Izzy, what do you think?' Percy looked at the supposed one that was called Alec. He was shorter than Percy but only by about two inches. He had black hair and the most stunning and clear blue eyes. Just like Jace, he had a radiant handsomeness. Izzy was the other female that had been confused and shocked at Percy's power.

"Only Warlocks have that form of magical ability. But he doesn't have that kind of distinguishing physical features that warlocks have. He appears human and mundane." Alec said as he looked at Jace who stopped pacing.

"There's only one way to find out." Clary the red-headed girl began approaching Percy with a twig in her hand, that appeared to have an aura.

"What are you doing? And what is that?" Percy said as he began to get up and back up.

Clary held her shadowhunter tool in her hand as she approached Percy. "This is a stele. It's useful for rune making. Now come here I'm trying to heal you." Percy could only frown at the words that were coming out from her mouth.

Percy however, let her come to her and felt her soft and warm hand began rolling up his sleeve and began drawing a symbol on his arm. The 'stele' was kind of hot to the touch went it touched his tan skin. When she had finished, he felt his body refresh and any of his small bruises he had gotten from the fight begin heal.

However, the shadowhunters were amazed at how quickly the rune disappeared almost instantaneously. As soon as Clary had finished creating the Iratze on Percy it was absorbed within two seconds.

"We have to take him to the institute." Clary finally deduced as she looked at the group.

"Uh no thanks. I do not want to go to the institute as you call it, sounds like an asylum for crazy people." Percy said as he began rolling his sleeve down.

The group looked at Percy wondering if they should heed to Clary's advice. As they were conjuring their decision, drops of rain began to fall and Percy felt more energized as the water was rejuvenating his strength.

"Fine. We'll take him. But just to figure out who is, and if he truly is a shadowhunter." Jace said as he pulled his hood over his head and began walking back the distance to the New York Institute.

Izzy, Alec, and Clary followed. Percy was having an internal conflict on whether he should follow them. He looked at the shadowhunters and in the other direction which would be to his apartment. But in the end, he decided he wanted to know more about the 'shadowhunters' and if they would be valuable allies to him…

Authors Note: So, this was a concept I was thinking of for some time. I don't know if it will receive any views or even follows. But it was something fun to write. It's just two worlds clashing and if it receives some good feedback, I can even continue the story's storyline and Percy's relationship with the mysteriousness of the shadowhunters.

I'm obviously going to include Annabeth if the story continues. I want the pairing to stay cannon to Percy's world. But this will most likely stay within the Shadowhunter world just because I want Percy to experience and learn about their world. Only Annabeth will be his companion from the Greek world If I continue this story. Fight scenes and actions are going to happen, it's just a matter of setting them up. Some might even believe Percy could be a danger to the shadowhunters and might want to dispatch him, but you'll have to find it. Or he could possibly be someone with power within the institute. Only I know