Bruce Lee: Sing supposedly studied under him and he'd held up as the perfect example of a Kung-Fu artist.
There are other characters shown with buck teeth but they're children and not Asian.
After a long tenure as group editor of the Batman line of titles, he retired to write full-time. Besides being the most important Batman writer of the 1970s, O'Neil served as an editor at both Marvel and DC. O'Neil earned a reputation for being able to revamp such characters as Superman, Green Lantern, Captain Marvel-and Batman, whom O'Neil (with the help of Neal Adams and Giordano) brought back to his roots as a dark, mysterious, gothic avenger. At DC, O'Neil scripted several series for Giordano and Julius Schwartz, quickly becoming one of the most respected writers in comics.
When Giordano moved to DC, O'Neil soon followed.