The Merchant
"Got sumthin' that might interest ya."
The Merchant is a hooded Ganado who aids Leon during Resident Evil 4 by buying and selling weapons, upgrades and healing aids. He has a strong British South Country accent and his reasons for being in the region are unknown. He is infected with Las Plagas yet seems to be acting against Los Illuminados, running if ever Leon brings other Ganados near to his hideouts. How he became a Ganado is not known but he may have been infected with the other villagers and the Plaga failed to take control of him.
Although he can be killed and despite the player being able to travel across an area encountering the Merchant in different places despite not seeing any sign of the Merchant having passed the player at all sugests there are more than one in game, this is likely a game mechanic and there is probably only one Merchant in canon.
Examining his weaponry, Leon muses that he has enough artillery to "start a small war". He also tends to says things when you do business like "Ha, ha, ha, thank you" (when you sell him something), or "Stranger! *laughs* What d'you need that for? You goin' huntin' an elephant?" (if you get The Handcannon). "Stranger... Stranger now that's a weapon." (Chicago Typewriter). He is usually found near a flaming blue torch (except for once, late in the game) away from other Ganados either behind buildings or inside caves but usually keeping a low profile (to anyone who doesn't know about the blue torches anyway).