There are a SHIT TON of differences between myself and him!
Scars: I'm actually a rather nice specimen of the Penguinite species, save for a few scars, which made me look rugged, rather than hideous. On the other hand, Deadpool looks like Freddy fucking Krueger.
Sexuality: I waver between Asexual and Heterosexual due to chemical imbalances caused by my regeneration. Deapool will fuck everything from wine bottles to barnyard animals.
Accents: There could be no clearer difference...
Clothing: My clothing varies, but I assure you, I have not EVER (By my own free will, anyway...) worn a technicolor gimp-suit into battle like he does.
Weapons: I dual-wield tactical axes, because they're badass. Deadpool dual-wields katanas, and somehow manages not to break them.
Diet: I enjoy the finer things in life. Like steaks, fish, and Pom-Wonderful. Deadpool treats his GI tract like a garbage disposal.
Sanity: I only see and think the kind of shit that Deadpool sees and thinks when I'm stoned or drunk...
Regeneration: Deadpool has some sort of wierd cellular-replication-on-overdrive thing going for him. My body is enchanted to conjure everything its biochemical and other needs immediately, which means I get more badass the faster my heart beats.
Fetishes: I only like reasonably chubby women, and sandwiches. Deadpool flirts with... Big Bertha... *Bleh*