As shit, here we go again.

Key: Logan Bitterleaf
Character: Zen Ryder
Skill(or transformation): Keyblade T4
Reasoning:

It's time to finally grow up.

There's actually a lot that I could list here for reasoning since the child stage for Zen lasted way longer than it should have. But I'll spare you that. Right now the main reasoning is that he wants to fight Jack. Partly because he took his eyes from him while still going by the name of 'Rym', but also because of something else. Recently, Jack killed a Namekian named Fiddel. And while he didn't particularly care for the man, something about the whole ordeal rubbed him the wrong way.

People don't care. They act like nothing happened, or they hear the news and go 'Oh, well. That's too bad.' Stuff like that doesn't fly with him, no siree. So he's going to go fight Jack, and probably try to kill him as well. It's futile, the Robot is way too strong. But he's still going to try, because it's better than sitting there, and doing nothing about it while he kills people who are supposed to be useful to the town's cause.

Getting T4 won't be enough, and if he's not spared by Jack, then he's going to die. But it's still something that Zen feels as if he needs to do, even if only to prove a point.