the Jesus trope is a character that “dies” but is too cool to stay dead, whether it’s Gandalf or Harry Potter or the J-dawg himself, and while it’s usually used to add a patina of suffering to the good guy it can also be used to redeem the bad guy, or the misunderstood catgirl in the case of She-Ra, where Catra takes an absolute beating before being brought back to life as part of her redemption arc.
the neat thing about this trope is that it conveniently punishes the character for any of their previous misdeeds (whether they be waging an aggressive war of invasion, betraying their friends, attempting to destroy the world, etc.) and allows them to return to the fold having already paid off their debt, I mean they literally died! what more can you ask of them!
but it gets even more interesting if you reinterpret the good guy reborn trope in the light of the bad guy redeemed trope, like maybe Gandalf deserved to get whacked by the Balrog? perhaps it wasn’t humanity that was redeemed by the sacrifice of Jesus, but Jesus that was redeemed by getting his ass kicked and coming back penitent and contrite.
the other incredibly common trope is the bad guy turns good but still has to die to atone for what they did, they can’t just chill.