Though his appearance suggests he is younger, he is actually 17 years of age when summoned. He has naturally curly blonde hair that flops, giving him a charming appearance. He feels in his own mind that he's the strongest of the Heroes, and undergoes stealthy missions to kill corrupt nobles and save villages, almost always just for the praise. Being a bullied child has left Itsuki with a desire to be special and superior. His sense of justice and need for praise both stem from this, as does his inability to deal with the meek Rishia, who reminds him of his weakness.