curlyfriski
Banned
I always assumed that Killua changed when Illumi put that needle infused with his nen in his brain to manipulate his behavior and make him more cautious so that he doesn't get himself killed. I think it was heavily implied that Illumi planted that needle during the final phase of the hunter exam and that's why Killua murdered that old guy and got himself disqualified, because Illumi was manipulating him.
Yeah but he was still cautious when fighting Shoot and he was the one obsessing over the unknown person in the Palace in the last couple of episodes, and both of those came after he removed the needle.