Board Thread:Manga/@comment-29900084-20160913010312/@comment-24036697-20160917201732

AhmedHadi1 wrote: CaptFredricks wrote: Huh. That sounds like something Levi would say though. Shan48 wrote: I completely agree. The unfitting line actually fits Levi pretty good. Isayama: Well recently Levi had a line, “I hate weaklings, they die too fast.” And now I feel like the statement mischaracterized him. I should really be more careful with such details, so that line might be modified in the tankobon volume. Please allow us to discuss it again during the anime production for it.

Full interview here. I'm not disputing what Isayama said, just that the line is definitely in character for Levi.