This particular Jason Todd has a CRAU where he and the other character were assumed to share a His Dark Materials type universe. Which means daemons. These are a part of the character's soul, not a separate entity per se.

(While death does separate daemons and their humans, in the canonical instance where someone went through the lands of the dead and came back to life, she reunited with her daemon afterward.) Would Jason be able to keep his daemon in Pumpkin Hollow?

[I'm just gonna strike my ideas about bringing one of the unnamed-in-canon Auxiliary Animorphs in... I'd really need a canon refresh. Though I do still wonder how to nerf a character with a shapeshifting ability...]