Luis Sera is a police officer from Spain. He helps Leon on his mission to rescue Ashley Graham in Resident Evil 4.
Resident Evil 4
Luis is a police officer in Spain who assists Leon in his mission at times. During the game Luis reveals that he is one of the researchers responsible for the creation of the Las Plagas. Luis tries to cure Leon, Ashley and himself but is killed by Lord Saddler (that is the sad and unfortunate ending for this character).
Also a cool fact to know, Luis can actually kill Leon at a certain point in the game. When Leon, Luis and Ashley are trapped inside a house and have to fight their way out against the Ganados; if Leon shoots Luis a couple of times, Luis will turn around and say "Adios Leon" and shoot you (this counts as a death, but it is funny).