Zuko

Zuko was being cornered by Toph and Sokka for something he said about Taga, specifically when he called Taga "attractive." What Zuko doesn't know is that he won't be able to sleep well tonight.

Before that, why did we get to that scene? Let's rewind a bit. The Avatar group was on a mission. They had discovered a frozen man and were trying to determine if he was a threat or not until Toph spoke, breaking the awkward silence.

Toph: Smells good for an old man

Sokka: eww

Toph: What? My senses tell me this guy is attractive.

katara: TOPH

toph: someone else confirm

katara: this is serious

Sokka: "What does it mean to be attractive?"

Toph: I just want confirmation, is it attractive?

Zuko: He's very attractive...

Everyone stares at him

Zuko: What? It is, it's in the bone structure.

Now we move to the present, Toph and Sokka cornering Zuko away from Katara and Aang

toph: So... taga, right?

Sokka: Right, that "very attractive" one, huh?

Toph: I don't know, Sokka, why don't we ask Fire Lord Zuko?

Sokka: You're right, Toph. Tell us more, what's so appealing about it?

Zuko: Uhm... bone structure? (Please don't kill me)

You are Toph