Karube is very welcoming and open, as he had specifically learned of how to make friends. Despite so, he prefers to stay and jokes around with Arisu and Chota. Karube is shown to have light blond hair that is shaved. He often has his eyebrows furrowed and is seen wearing his button shirt with a chained necklace most of the time. He's tall and can fight very well, making hurtful punches, so he's probably a little muscular