XAVIN: "Hiding in plain sight" has another meaning in the skrull language... "Begging to get caught." We should not even be running! We should not have to hide!
VICTOR: Here it comes.
XAVIN: This is where we should be! Is this city not home to Earth's superhumans? And yet we are fugitives. We are treated like criminals when we should be the rulers of this world!
XAVIN: Nico? My love, it's me.
KAROLINA: Xavin?! What are you doing? Is... is this supposed to be some kind of sick test?
XAVIN: I wasn't trying to deceive you, my betrothed. You're usually able to recognize my scent, no matter what form I take.
KAROLINA: Then why?
XAVIN: Because Molly told me I made you uncomfortable. I thought you would feel more at ease with a shape you already liked.
KAROLINA: Xavin, I like you. I just want you to be yourself.
XAVIN: But I have no idea who I am.
The point of it being a combination of who she feels they should be/have the right to be from the outside world and also that idea she should be herself in her form (I could also toss in the exchange about being female when stressed).
MOLLY: Can I ask you a question, Xav?Which username do you think is the better choice (for meaning, how it looks, reads, etc): shouldbexavin or boygirlalien?
XAVIN: If you must.
MOLLY: How come you're not a girl all the time?
XAVIN: Why don't you wear the same ridiculous hat all the time?
MOLLY: Because my hair gets so tangly that my mom told me birds would start to live in it? But that's different. I mean, Karolina is a... she likes girls, right?
XAVIN: And you have a problem with that?
MOLLY: No! Duh! I have a picture of Northstar on my wall and everything! It's just, I think everybody would be more comfortable if you could maybe just look like a girl forever.
XAVIN: And I'm sure some people would be more comfortable if Karolina liked males. Or if you were not a genetic mutation. But I am not like everyone else, and that means you have to learn to accept something new and different, as my betrothed already has.
MOLLY: If you say so, I guess.
Xavin first appears as a boy. Then as an alien. Then Xavin becomes a girl for Karolina. We see Xavin often in female form but she still uses her male form on a regular basis. During battle, Xavin often goes to a skrull form. Yes Karolina considers a girl her true form, but for Xavin she has all of them. Xavin is a boy, a girl, an alien, and the construct of gender is understood in a very alien way.