Analysis of information sources in references of the Wikipedia article "突出角色" in Chinese language version.
Originally, the Arthur "Fonzie" Fonzarelli character was to be a comic relief dropout type, put there for comic contrast to the whitebread Richie and his pals. He was a tall, lanky guy, but when Henry Winkler blew everybody away at his reading, they decided to cut Fonzie down to Henry's size. Ultimately, Winkler molded the character around himself and everybody, including Ron Howard, realized this would be the show's "breakout" character.
Originally, the Arthur "Fonzie" Fonzarelli character was to be a comic relief dropout type, put there for comic contrast to the whitebread Richie and his pals. He was a tall, lanky guy, but when Henry Winkler blew everybody away at his reading, they decided to cut Fonzie down to Henry's size. Ultimately, Winkler molded the character around himself and everybody, including Ron Howard, realized this would be the show's "breakout" character.