[Matrixbeast]

What's wrong with Mutsuki's redemption arc? I'm curious.

Also, my personal favorite redemption arc is Rio's, from Gekiranger. Mainly because he ultimately knows he doesn't deserve it. He got played and manipulated by Long, but he knows that he's done too much to justify that as a reasoning for his actions.
He was even willing to let GekiBlue kill him before his self sacrifice.

And for a redemption arc that I disliked, Abare Killer. But considering he was only redeemed last minute because of Bandai's pressure thanks to his poor toy sales, I can understand.

In general, I enjoy a redemption arc. It helps give depth to a former villain when they see how their actions have caused so much misery. I just dislike when they get a free pass for being an awful person because they helped punch a worse enemy.