Full Name: Alexander Joseph Lee. 28 years old. Was "Alex" from a young age, then, in his late teens, started signing some emails "Lexi." If your character has ever asked about this, Alex would say that some days he's Alex, and some days he's Lexi, and it's, like, an energy thing. If your character found this confusing, Alex told them not to worry about it.
(If your character's the type who would ask/remember: when he's Alex, he/him pronouns; when they're Lexi, they/them.)
Alex found his niche as a Firewatcher in the study of rituals, the methods by which humans either commune with or become monsters. Outside of that, he's avoided taking a more 'traditional' hunter profession by gaining notoriety as an electronic musician and DJ. He mixes and performs music under the pseudonym T4rØt, and takes advantage of the EDM scene's willingness to accept anonymous performers. Whenever Alex/Lexi appears in public as T4rØt, he's/they're covered head-to-toe and wearing a mask.