Hahaha well, often people(myself included) typically choose a character appearance that visually matches the character's personality. Someone in a clown costume, you expect them to be goofy. Someone in a business suit, you expect them to be very serious. Of course, some people purposefully choose an appearance that gives a completely different vibe from the characters personality(the appearance of a little girl, but actually being a bloodthirsty killer). 

So, anyways, his appearance just gives off a very playful and joking and jolly personality. Although, being a bit of a pervert who chases skirts could just as easily fit too! haha