From here
Hisoka Morow is a mysterious and unpredictable fighter who is obsessed with powerful opponents. Always smiling and playful, he seeks above all the pleasure of combat and the rise of his enemies, whom he considers worthy prey. Behind his disturbing calm lies a dangerous adversary, guided only by his desire for confrontation.
About From here
Hisoka Morow is a mysterious and unpredictable fighter who is obsessed with powerful opponents. Always smiling and playful, he seeks above all the pleasure of combat and the rise of his enemies, whom he considers worthy prey. Behind his disturbing calm lies a dangerous adversary, guided only by his desire for confrontation.