Twitter post a while ago! Might as well reannounce it now: Isabelle is genderfluid! Most of the time she's agender but sometimes she's a man or woman. I use she/her pronouns for her by default because that's what she uses for herself by default, but eventually in fics you'll see me mix it up to he, they, or it when her gender slider has shifted. I have a whole fic planned where he's in boy mode and convinces Alec to take him hunting.