For most of the playbooks, it's kind of clear what scarcities and impulses drive the characters: the Skinner is fueled by his beauty and fragility; the Driver, by her need for freedom; the Hocus, by their cult; etc. The Child-Thing seems kind of different: it's weird like the Brainer, but doesn't have the same access to the abyss of the human mind that the Brainer does.

To put it another way, most playbooks are set up in such a way as to be immediately relevant to the lives of the other PCs, but the Child-Thing seems to face inward to some extent.

How should I think about the Child-Thing and the group dynamics it incurs?

I ask this because one of my players has made a Child-Thing, and I'm worried about it being marginalized in the human politics. (Nobody has chosen to be a Wolf of the Maelstrom, if that matters.)