Luis Sera is a researcher in Resident Evil 4 hired by Osmund Saddler, but he betrays his boss and works with Leon to help him get hold of the samples. However, when Saddler finds out about the betrayal, he gets his sample back and kills Luis in the process. Luis gives his new friend medicine to suppress the growth of the Las Plagas inside him.
He Is Reffered By Ada As A "Womanizer" And "Mr. Cool"
He doesn't use any weapons except his Red9 and a few healing items.He also has good surviving skills like Leon.