The Hider

The Hider / Rowan Quincey is the spirit of a teenager who was murdered when someone broke into his house and stabbed him. He possessed his copy of Yoshi's Island for the SNES. After his death, his parents sold the game with him in it. Now, this copy of the game keeps getting passed on from player to player, with him hoping to meet and kill his killer. Unfortunately, he keeps thinking every player he meets is his killer, so he keeps killing them. And when he realizes that they're not the killer, it's already too late. This is because part of the game's code affected his mind, causing him to go insane.
Appearance
The Hider takes the form of a tall Yoshi with red skin, black claws and feet, and black scales, which are torn apart. He has a wound on his chest from where his killer stabbed him. Compared to other Yoshis, he only has one eye, which is yellow, and it seems to be realistic. He also lacks a shell and a mouth.
Biography
Origins
In the 1990's, Rowan Quincey was a 14 year old who loved everything Mario-related. Specifically, anything revolving around his favorite character, Yoshi. So when he got Yoshi's Island for his birthday, he was estatic. He loved the game so much, and thought it was the best game Nintendo has ever made. He managed to beat the game in just under two weeks.
One night, his parents were out of town, and he was already asleep on his bed. Suddenly, there was a noise that woke him up. He went to check it out, and when he did, he saw that someone had broken into the house. They were wearing completely black clothes and a clown mask to cover their face. The trespasser pulled out a knife and chased Rowan all throughout the house. Eventually, they caught him and stabbed him in the chest, killing him
A couple weeks later, Rowan woke up in what appeared to be a black void. He remembered being being murdered by whoever broke into his house. He couldn't believe he was dead. He started to panic, because he had no idea where he was.
Rowan then noticed a light. He walked towards it and saw gameplay footage of Yoshi's Island. He then noticed another light and saw a teenage girl playing with a SNES controller in a house he wasn't familiar with. That's when he put two and two together. His parents sold the game after his death, and his soul somehow got inside the cartridge.
Then, Rowan felt pain in his head, and it was unbearable. After a couple minutes, the pain stopped, but it had completely twisted his mind. He looked back at the girl with rage. He now thought that the girl was the one who killed him.
Rowan now wants to kill the girl, and decides to do so by going into the game itself. He uses the game's code to transform himself into a Yoshi. He appears deformed, but he doesn't care, and goes into the game and waits to catch them off guard.
In-Game
He can appear at the end of any level at any time. At the end of a random level, he will be waiting for you. He'll look at the player and say "Let's play hide and seek. I'll hide, and you seek." The level will then turn negative colored, with your character keeping the same colors. You go through the level looking for him. When you find him, he will scratch your character in the stomach, which will make them bleed. He will then grab them by the throat, and squeeze them until their head actually explodes. He will then look at you and say "You know what you did." You will then appear at the beginning of the last level you played with one less life, and continue the game like normal. This happens 3 times. After the first time, you will feel like someone just stabbed you in the chest. After the second time, you will have a massive headache, yet you'll feel like you need to continue playing like the world depends on it. After the third time, the screen will show his head facing the screen in front of a black background. The , you start feeling pain in your heart. You will have a heart attack, and then you die.
Abilities
He can change the game to make certain objects have different colors. He has the power to switch between his human form and his Yoshi form. He chooses to stay in his Yoshi form, due to his human form reminding him of his past life. He can bring the souls of players he kills into the game, but he chooses not to, because he doesn't want them to feel the pain of the digital world. The exception is for when he finds his killer. He has the same abilities as every Yoshi in the game, but at an increased power level.
Weakness
Data from the game's code can sometimes get inside his mind, which will make feel immense amounts of pain.
Trivia
He's already dead, so you can't kill him. He is morally different from other Yoshis. He doesn't take crap from anyone. You better pray you don't get on his bad side. Like mentioned above, the wound in his chest represents where his killer stabbed him before he died. When he is reminded of his past he takes his anger out on the Yoshis. Despite not having a mouth, he has a voice, which is a deep version of Yoshi's voice from the Super Mario World Cartoon. He and GB would be good friends if they ever met. He is a huge fan of The Simpsons. Specifically, anything from Seasons 3-6.