User blog comment:KiruSama/Levi and the Titan Serum/@comment-27249438-20151126204926/@comment-26998423-20151206143704

I like Levi the way it is.

Otherwise, regarding the Serum issue. I'm not sure. In fact, it was said that only someone of the king's family could keep his mind while injecting himself the serum, with the exception of Eren, which had to eat/kill his own father.

So i bet, he would also turn into a "mindless" titan himself, if he injected himself the serum.