Adrenawin is a Infilation from the planet Lako'ye created by Jack..
See the photo.
When in battle, Adrenawin is a small frail creature. However, as soon as he feels threatened, he bloats up to a giant raging monster ready to kill. In his monster form, he has strength, agility, durability, flexibility, but loses his intelligence, sort of like Hulk.
In his frail state, he can easily be beaten.
His name is a pun on adrenaline and win.
His power is similair to the DC sidekick, LagoonBou.