Because you like Ezio Auditore Da Firenze in Assassin's Creed Series
Ratchet is a shoot-first, ask-questions-later, and then-shoot-again kind of lombax. See them in Ratchet & Clank.
Big Boss is a disillusioned mercenary commander who wants to create a world for soldiers (and soldiers alone). See them in Metal Gear Series.
Daxter is half otter, half weasel, all snark. See them in Jak and Daxter.
Jim Raynor is a decent man in an indecent universe. See them in StarCraft.
Kind and friendly, Rinoa Heartilly is nonetheless an effective freedom fighter. See them in Final Fantasy Series.
If anyone can stay optimistic and friendly under harsh alien rule, it's Alyx Vance. See them in Half-Life 2.
As a monster-hunter cursed with supernatural abilities, Geralt of Rivia is a cynic burdened by scruples in an unscrupulous world. See them in The Witcher.
Jin Kazama is a fearsome warrior torn between the darkness and the light. See them in Tekken .
M. Bison is a diabolical megalomaniac hell-bent on dominating the world. See them in Street Fighter.
Tidus is upbeat, carefree, and desperate not to become his father. See them in Final Fantasy Series.
A believer in the pursuit of justice, Garrus Vakarian hates it when bad guys slip through the cracks of the bureaucratic justice system. See them in Mass Effect.
Zeratul is cryptic, mystic, and not to be messed with. See them in StarCraft .