When you are preparing a character which you think is inherently funny, don't overlook the inherent part of that viewpoint. Inherent implies potential; that is, a character is potentially
funny. They have the inherent
capacity to be funny; but they are funny best IF AND WHEN...and this is the important part...the character is realized by their reaction to a situation. REACTIONS... reacting whether emotionally, facially or in dialogue "characteristically" to a situation (or to other people) is what makes characters truly and lastingly funny.