Runaways star Clarissa Thibeaux, who plays Xavin in the final two seasons, confirmed that her character is indeed gender fluid. She went on to discuss how Xavin's alien nature factors into that identity.

"I'm not sure if it's going to be more explored this season, but Xavin is -- within the fandom too -- they/them," she told MEAWW. "Everybody loves that Xavin is genderless. So I see it as, [with] a cosmic being, gender's not a thing. Humans? Gender is a thing. So, on the show, Xavin does shape-shift into a man and a woman."

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When introduced in Marvel's Runaways Vol. 2, Xavin was a Super-Skrull in training who came to Earth for Karolina Dean, who was promised to them in marriage by her parents. Exiled from their homeworld Majesdane, the Deans struck a deal with the Skrulls in exchange for transportation to Earth. The marriage between Karolina and Xavin was intended to cement the alliance -- but, of course, the Deans expected Xavin's family to die in the invasion of Majesdane. It came as a surprise, then, when Xavin came to Earth to claim their bride.

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On the show, however, Xavin is not a Skrull and their origin has changed significantly. They are a Xartan, another shape-shifting alien species in the Marvel Universe. They were a stowaway on the royal ship that carried Karolina's father Jonah, his wife and their two kids. Xavin's energy was freed when the ship was destroyed and they sought out Karolina, believing they are part of some ancient star-crossed lovers' prophecy.

Marvel’s Runaways Season 3 stars Rhenzy Feliz, Lyrica Okano, Virginia Gardner, Ariela Barer, Gregg Sulkin, Allegra Acosta, Angel Parker, Ryan Sans, Annie Wersching, Kip Pardue, Ever Carradine, James Marsters, Brigid Brannagh, Kevin Weisman, Brittany Ishibashi and James Yaegashi. The series' third and final season is now streaming on Hulu.

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