Leon, for sure.
I fell in love with him since RE2 (8D), and I couldn't bear Ada !
I also liked Luis, he was funny. "Got one very important question. . . Y' got a smoke ?" lawl. It was kinda sad he had to die, though.
Ashley was the most annoying character, on the contrary. She was sooo unuseful. If she could hold some gun like Sheva in RE5, just to help Leon sometime, that would be great.