"Assassination—It's the family trade. We all take it up. My folks see me as an exceptional prospect. But I don't see that I should have to live up to their expectations."
Initially, he is introduced as a character who appears similar to Gon: cheeky, cheerful, and full of mischievous ideas. However, contrasting Gon's politeness, he can be quite rude to others, mostly strangers and older people. He is also one of the quickest-thinking characters and often analyzes a situation with great ease and accuracy. However, his ruthlessness and aptitude in killing show the other side of him—deadly, violent, and bloodthirsty. Conflicting with his predisposal to kill is his unyielding loyalty to his friends and natural kindness. He claims Gon was his first friend, and he grows progressively more attached to him as time passes. He often suffers immensely in his attempts to help his friends without a single complaint. He puts others before himself without being concerned about his own health or even his life.
He canonically has Gon's smell on him, so his scent is a masculine and woodsy smell similar to his fragrance. However, his scent is more of a "lighter" scent to better match his personality, skill set, and the estate from where he is from.