Your friend with the pink hair, the excellent vocabulary, and the totally inappropriate wit? You could probably call her quirky, meaning she’s unconventional and has a strange mix of traits that somehow end up being kind of interesting or charming.
This informal all-purpose term can be used to describe anything that doesn’t quite fit in. The adjective quirky is often used to describe those unconventional things that are characterized by peculiar behavior or an unexpected point of view. Quirky is often used to describe people, but it can also refer to things that seem to possess an unexpected and unconventional element, like a quirky strategy or a quirky idea.