poser

A particularly difficult question or puzzle.

“Always so energetic, Hastings! And what precisely would you have me do?” This was somewhat of a poser, but I was not going to withdraw from my position.

Someone who asks a question or sets a problem.

Even as a child, she was a habitual poser of difficult questions.

Someone who, or something which, poses; a person who sets their body in a fixed position, such as for photography or painting.

A poseur; someone who affects some behaviour, style, attitude or other condition, often to impress or influence others.

"My boyfriend, or I should say, ex-boyfriend, used to be all dark and brooding with long, black hair, but now?!" [...] "Um, I'm pretty sure uniforms don't work that way. I think your ex might just be a big poser." "A fact I would be blissfully unaware of if not for these damn uniforms!"

Started hormones and these bitches called me a trans poser / They can kill themselves, I'm turning up like a transposer

A surname from German