Kurt is Reina's older brother—a 9-year-old kid who's basically defined by his need to look out for her. He and Reina were the first humans the Queen ever ate, which is kind of a big deal in the story's timeline. What's interesting about Kurt is that his protective instinct didn't just disappear when he died. It actually carried over to Colt, his reincarnation as a Chimera ant, and ended up shaping who Colt became mentally. So even though Kurt's gone, his core desire—to keep Reina safe until she finds someone she cares about more than him—became basically hardwired into Colt's personality. It's one of those rare cases where a human's emotional legacy genuinely shapes a completely different being.
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