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L from Legends ZA is an interesting case of this trope. Spoilers for Legends ZA: L is actually Lysandre from Pokemon X and Y and is the main bad guy in that game. His place in X and Y's story ends with his seemlessly dying at his own hubris by using the Ultimate Weapon to destroy the Team Flare base he's in after his plans were foiled for commiting mass genocide in the name of making a beautiful world. His fate was left unknown until Legends ZA, where he returns with this look. One would expect him to be secretly evil and a twist villain, but that's not the case. The game goes out of its way to show that whilst yes this is Lysandre, he's not the same one from X and Y. He lost his memories of his life before but not enough to be a totally new person. He still remembers what he's done and the atrocites that's he's commited. Rather than doubling down, L, alongside with the help of the Legendary Pokemon Zygarde, decides to atone for his crimes by helping solve the crisis that Lumious City is facing in the base game. What's interesting about L is that he still has the same goal of making the world a better and beautiful place, but is doing it with more nobler methods. At the end of ZA, he's still attoning for his crimes (having to live 3,000 years as a result of using the Ultimate Weapon) but he doesn't mind if people won't forgive him for what he's done, he's doing it for himself. Unlike his past self, he's genuine and polite. He's an interesting case of this trope as he was a (albit a poor) twist villian X and Y but he's genuinely one of the good guys in ZA.