These characters also tend to focus on the 'I'm not that pretty trope' where they find themselves unattractive and another character (usually a male) who likes them or is close to them reassures them they are very pretty/beautiful/sexy ect.
These characters are often outed at some point in the story through various means. A reverse-trap is a heterosexual (usually) female character who dresses like, looks like or pretends to be a boy and 'passes' to the extent that NO ONE other than perceptively intelligent characters or complete degenerates (skirt-chasers) recognize them based on 'bone structure', 'having suspicions' or 'always knowing'.