this is actually kind of a tough one! you'd think it would be something easy and stupid like Mario but you'd be WRONG
i think i enjoy forgotten/abandoned characters the most. the Pulsemans and the Tombas and the Sparksters and those characters that appeared in like one demo of an indie game that never got a full release. sidekicks are good, too; Tails is a much more interesting character than Sonic, Roll is a top-tier cutie that could kick Mega Man's ass, i would kiss Popka after placing him lovingly in the garbage.........