very very simple premise: who are some of the most criminally underappreciated characters that general audiences and fandom rarely talk about? I want the obscure of the obscure, none of the "underrated" heroes that everyone knows about (looking at you Zatanna and Booster Gold); i want some really "...wait, who?!" characters.

bonus nerd cred if they pulled off some incredible feat that went largely ignored by fans and the general public.