@HereComesTheSnow - Plot twist: Shiro's ultimate form of "his" mastered Semblance permanently removes the illusion he was ever male, revealing that the tiger-boy was a tiger-girl all along.
Black Hanekawa Shiro.
And thusly, the Harem grows.
Purely because I love the Monogatari series and the main protag whom Luke is inspired by.
That would explain so much.