Well currently 3/35 are retro (Pit's not anymore), and if the pattern of adding two continues, and the roster ends up being around ~50 characters, then 10% seems a good amount, not counting trophies, stickers, songs, etc. because then it would be under 10%.
I know 10% isn't an option, but I feel 0 is too low and 25 is too high, so I'm sticking with 10, even if it means my vote doesn't count.
edit: I guess my vote counts now.
edit: I guess my vote counts now.