[Snake]

Or if when using the said 'death' stamp, you can't have the same IC name as before while remaking in Pink's Tower?

"People can now get the chance to turn their Vampires into Oracles, somehow resurrect their Dullahans as Mechanations, and generally get to access everything that wasn't included in LE's 'change your race' category for lore reasons?"
Chaos is right, because the player could opt to not change their char's name and appearance with that. Though, forcing them to 'make another char' may be the solution, imo.

(I saw some Dragon Ball 'yond games with name locking. [i.e One is named Snake, other can't name their char Snake.] That can't be that hard to code, I guess?)

PS: Doe, some people don't understand what reincarnation means, so well... Will still be a pain in the ass for GMs and players in the end.
PS²: All of this could be a verb for GMs? I mean, they already do control death anyway, to an extent.