[Revillution]

Characters then, here we go

Street Fighter, Sagat (he would kill Ryu in a real fight, not opinion thats a fact)
King of Fighters, Irori Yagami
Darktalkers/Vampire series, Demitri Maximoff
Guilty Gear, Sol Badguy
Samurai Spirits/Showdown, Genjuro Kibagami
Tekken, Paul Phoenix
Virtua Fighter, Kage Maru

As many of you can understand I'm sure it is very difficult to only mention one per series so just a few others that I am very fond of are, Terry Bogard, Gouki, Geese Howard, Ryuji Yamazaki, Kim Kaphwan, Vega, Blanka, I'll leave it there.