1. Killua Zoldyck: he is a strong loveable character! 2. Illumi Zoldyck: honestly can't explain this. He's just so interesting. 3. Hisoka: He is somewhat humorous and freakishly strong! 4. Feitan: he's not on screen much, but he's still fascinating. 5. Zeno Zoldyck: powerful, intelligent and memorable character.