Theo, who previously identified as transgender and is now nonbinary, explained how their views on gender have evolved since first coming out. In an interview with Vogue, he said, "Because I grew up around these rigid gender roles, when I was 18, 19, my coming-out process was about over-correcting myself in order to fit into this other part of society...During that process, I was like, ‘Yep, I’m definitely a boy, I use he/him pronouns, nothing else.’ At the time, I still kind of felt like I was in the middle, but that space to exist in was very small. The work environments that I was in were very masculine and kind of intimidating, and I was trying to blend in." They began identifying as nonbinary at age 22, saying, "I was like, ‘I’m just going to do whatever I want and I hope that some other people follow suit.’”
Theo's pronouns are he/him and they/them. He told Advocate, "...I really like both. I think that my history is being a very masc person and existing on one half of this big spectrum. I love being called 'he' and I love being called 'they.'"