The large, loud one, written as comic relief in a series that later decided comedy was the point.
Volstagg is a member of the Warriors Three, a warrior of Asgard who loves to eat. Ray Stevenson plays him in all three Thor films.
There is an irony worth noting. The first two Thor films kept their comedy in one character and played the rest straight; Ragnarok made the whole film funny and had no use for him at all.