They've made games using Vaati multiple times...

Now they should use Agahnim again. Or at least remake Link to the Past on a system (even though it's the RE4 of the series (released multiple times)). Although he's not the main boss in the game, he still felt like it. When I first played this I thought he was going to be from the number of times he appears. I rmember Ganon being mentioned at all till late game, the entire game was focused around Agahnim.