The father and leader of the Achino Family, he is a very large man who has spent most of the arc laying down on his bed and drinking. Currently, it's his birthday, a large event amongst the family, and eagerly awaits his present, the flag and crew of the Strawhats. Because of the wait, he becomes impatient and starts showing his power, the ability of the Atsu Atsu no Mi (Atsu meaning heat.) which allows him to heat up his own body and thus things he touches. Even when angered, he keeps a calm attitude even to strangers, such as Zoro when he had stumbled into Lovely Land. He even shared a few drinks with him and having a discussion about how people can annoy them (since both are waiting for someone).
Source - Wikipedia