Who played the first owner of Arnold's Drive In on Happy Days?

Answer 1

Arnold's Drive-In was first operated by Arnold,played by the late Pat Morita. When Morita left Happy Days, Al Molinaro joined the cast as Al, who purchased Arnold's & changed the name to Al,s Drive-In.

Answer 2

The Late Pat Morita.

Addendum:

Actually, Morita only played "Arnold" (his character's name was Mesuma Takahashi) for seasons 3 (1975-1976) and 11 until the end (1982- 1984). During Seasons 4-10 the owner of "Arnolds" was Al Delvecchio, played by Al Molinaro from 1976-1982.

Answer 3

Matsumoto "Arnold" Takahashi (Pat Morita), First depicted owner of Arnold's Drive-In (1975-1976), he obtained the moniker when he purchased the restaurant and people addressed its new owner as "Arnold".