Name a villain of an ongoing you wish to see redeemed. Careful with that spoiler finger.

Airi Yunami from Qualidea Code.
Her race(the Unknown), manipulated children for their own use after conquering at least part of Japan.
However, she began to genuinely think of the children as if they were her own.
In episode 6(which was before the reveal), she was given a pocket watch by Maihime, in return Ai asked Hime to come back for the watch, which could provide hope of redemption for at least Airi.