Arnold is the owner of Arnold's Drive-In. He is a short, tan-skinned man with a grey mustache. He can do karate, dance and speak Korean, Chinese, Japanese and English. His mother was Chinese and his father was Japanese. Arnold and Arthur "Fonzie / The Fonz" Fonzarelli are good friends. Richie Cunningham, Warren "Potsie" Weber and Ralph Malph often complain that the food is bad/the place is dirty, but they don't really mean it. Arnold never cleans the place, he has a boy named Daniel come in once a week to clean everything including his car, under the pretence he is teaching him karate. He often talks about how certain behavior among the teens (particularly Johnny) or sometimes the adults might make him lose money. Arnold also writes replies on the bathroom wall to the graffiti the kids wrote.