Wesker and Boulder. I'm still waiting for the series' true ending where Chris teams up with his illegitimate son, Pebble, and they take on the true villain behind it all that captured Boulder and moved her to random parts of the world, like in the Mansion, Spain, and Africa. Also, during Leon's campaign, I spotted Boulder's younger brother, Giant Rock.
"Do not fear the AI director, for Coach, Louis, and the Holy Chocolate protect all who believe in them." Pills 2:17