It can be argued that Hideri is a misrepresentation of trans women, though in canon he is just a crossdresser. The "trap" trope is somewhat played into (his word in the intro is "surprise"), but the term is not used itself. Still, be wary if this may be upsetting.
Hideri is a crossdresser and it is sometimes played for laughs, but I wouldn't say he's the butt of the joke overall. He's mainly treated kindly by the others, barring the occasional dragging him into the correct restroom for the audience's amusement.