So I’ve been looking around behindthevoiceactors (dot) com, and I found out that Luffy’s
voice actress, Mayumi Tanaka, was also the Japanese voice actress for
Skippy Squirrel from Animaniacs,
Louie from We’re Back! A Dinosaur’s Story, and
Tony Toponi (in An American Tail: The Treasure of Manhattan Island for sure; Not sure about the other films)!