There are a couple of options here.
Quien es aplicado, can mean "who is diligent" or "who is industrious" or "who is studious".
it's quien eso es?--- it means who is that?----eso es---means that is---you could say eso es quien? which means that is who?
¿Quien es?
who is that for
¿Cómo estás? = How are you? Quien es usted/quien eres = Who are you? (Formal/informal)
Oh, dude, "quien es" means "who is" in Spanish. So, if someone asks you "quien es," you can just say the name of the person they're asking about. It's like playing a really easy game of guess who, but without the game board.
Who is that
quien es means "who is" like someone knocking on the door "who is it?" in spanish it would be "quien es?" or also "who is this person?" - "quien es esta persona?"
"Pregunto quien es" means:I'm asking, who is he?
quien es tu papi
Who is that
La profesora es... *and you insert her name here*
Hopefully better than how you said it in English ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The answer above lmao!'A quien es su novio/a' or 'a quien eres tu citas?'