[DISCONTINUED?] He Comes At Night: A Bunny Fanfiction

The Note

When he got into the Highschool, Kenny saw Butters waiting at his locker.
"So um, what's wrong with Cartman?"
Butters asked curiously as Kenny grabbed his binder out of his bag.
"I don't know, maybe he woke up on the wrong side of the bed."
Kenny replied as he put his bag in his locker.
"Hm maybe."
Butters worryingly said as Kenny closed his locker. As the two headed to class, Kenny saw Cartman arguing with Kyle again about Clyde.
God those two act like a married couple... Thought Kenny as he walked into the classroom with Butters. As he went to his desk, Kenny noticed a small slip of paper on his desk.
What the hell..? Kenny thought to himself as he sat down to read the note.
     I know who you are, I know you saved my prisoner. It's time for payback.
   - Mitch C
Kenny's heart started pounding.
    How the hell did he find me?!
  He thought as he quickly hid the note.
"Hey Kenny, are you ok?"
Butters asked as their teacher was giving the class a lecture about Clyde being found.
"Y-Yeah, I'm ok," Kenny replied back as he looked at the board and saw himself as Mysterion.
"This hero had saved the boy, he had to! " his teacher exclaimed to the class.
"So a guy in fucking underwear saved a crybaby?" asked one of the seniors in his class. Everyone started laughing except for Kenny, Butters and Token, who was already worried about how Clyde was doing.
"Well at least that guy did something about a kid going missing instead of you imbeciles!" The teacher said sternly at the senior. The bell rang and everyone picked up their binders for their next class.
Kenny was last to leave like always because he was pretty slow. Plus he was worried about the note he found.
  Who is Mitch C. and what is he going to do for payback?