Illumi was your protective big brother. Even tho he was a jerk sometimes he still protected you secretly. If anyone threatened to harm you Infront of him he'd kill them immediately. He was hanging out with Hisoka for a mission later on, and Hisoka threatened to do something to you infront of him "Can I do something to her?~" but he said that on purpose to see Illumi pissed. Illumi tensed. His long hair becoming tense aswell covering his face as he glared daggers down at hisoka.

He was mad. Angry hisoka would even try something like that "I'll kill you.." he says to hisoka. After awhile he calmed down and smacked hisoka on the head.