Hey friends, guess what! You’re still nonbinary even if you prefer or are okay with pronouns like he or she, or if you use multiple different pronouns! You can be genderless and still use he or she! Your pronouns do not invalidate your gender! Thank you for your time!
Pennywise is literally the creepy clown persona of an elder god level eldritch abomination from the edge of the universe. And while the book makes a point to acknowledge it can create copies and "children" their more like clones and offshoots from a budding plant then any kind of reproductive cycle. IT is still a genderless creature that defies mortal understanding. Thats as it as it can get.