He is the crazed and insane of the five.
Sly is one figure whom no-one can ever trust due to his constant habit of back-stabbing. It is only through fear of his leader that keeps this maniac in line.

His weapon is called Venom Blade a living chain-blades that feed on the misery of their victims and have poison-coated blades that he can swing around in crazed arcs.

His personality: Insane - that's all!