'Mione!! Zhaneel knew a Hermione else game before coming to Arda, so that'll be a hoot! She's a gryphon that can take a human form, and her own canon makes her immune to magic cast upon her (because she is a species that was originally constructed by magic). IE: were someone to fling fire at her and the like, that sort of stuff tends to work as it's physical... It's the metaphysical/subliminal stuff that tends to fail (mind control, etc). Healing spells or productive charms all work fine, though it might take a little more focus to get them to 'stick'.

Totally open and fine wth any of the bad subject matter that might come up, as Zhaneel had plenty of it in her own background anyway.

Also, Zhaneel (when human) often wears a disillusionment cloak (ie: cloak of invisibility) that she got from Aragorn else game (who got it from Hermione). Ahh, the tangled webs we weave!!

Also, Zhaneel acted as a messenger before and had no qualms delivering missives back and forth between lines if you'd like another route besides patronuses. :3