What popular Disney character is known for his catchphrase, "Oh boy!"?

Mickey Mouse is well-known for the catchphrase "Oh boy!" which reflects his cheerful and optimistic personality. As one of Disney's most iconic characters, Mickey often uses this phrase in various cartoons and media to express excitement or anticipation. This catchphrase has become synonymous with his character and is often associated with the joyful spirit of Disney itself.

The other characters listed, while also popular in their own right, do not have "Oh boy!" as a recognized catchphrase. Donald Duck is known for his distinctive voice and often expresses frustration through exclamations that do not include "Oh boy!" Goofy, another beloved character, has various expressions and sayings, but "Oh boy!" is not primarily associated with him. Pluto, being Mickey’s pet, does not vocalize catchphrases as the other characters do, as he primarily communicates through barks and body language. Therefore, Mickey Mouse stands out as the character connected to this specific and memorable phrase.