What is your idea about me?

What is your viewpoint about me?
What is your thought about me?

(Answer) I think you are arrogant.

(Are the questions all grammatical?)

What are your ideas about me?
What are your viewpoints about me?
What are your thoughts about me?

(What about these ones? Do we have to use plural forms or singular forms?)

Your choice on singular or plural. One thought, one viewpoint, one thought or more than one?

Sra