Sooo...Its more like calling Lusche a 'Germ'?
More like Jerry or Kraut, neither of which are appropriate. Jap I suspect is more often used as an abbreviation, because I doubt many realize that it has become a derogatory term.
Those terms when used as slang, are not appropriate to use to address someone of their respective nationality.
Kamikaze is not derogatory, at least by itself in a sentence. The problem lies in how callously many treat the term. In historical reference if a Japanese pilot intentionally crashed into the enemy in order to destroy himself and his adversary he is just that. (The Japanese did not use this term, though) That's appropriate.
Asking in the wishlists to be able to become a kamikaze is totally inappropriate because of how lightly that concept is obviously being taken. We're cartoon pilots dying doesn't hurt. This is what i suspect you want a ban for, but it is not the word that's the problem, it is the childish and frivolous way that it seems to come up over and over "specifically" in the wishlist.