I chose Corrin as #1, and Terry as #2. I think there should be less Fire Emblem, but I don't know the series, so I can't say on that. I think Dr. Mario and ROB are equally pointless, but I personally perfer ROB.
Corrin represents a significant game at least. Dr. Mario is more arguable, but I just think that since R.O.B. is literally an accessory that had TWO games, he's easily the least important.