[ver_ture]

I would enjoy this different type of classifying genre, and smaller libraries or passionate stores could use both, scifi-identity, or adventure-isolation, mystery-family.

An interesting appliation would be Orson Scott Card's Ender series, which take a turn! Ender's Game? Perhaps scifi-responsibility, as that is the main issue Ender grapples with and has to decide. Speaker for the Dead? Scifi-empathy, and Andrew resolves inter-species traditions, and language, I think.

Children of the Mind might be about belonging, but the point is that this harder-to-create classification benefits readers 100x more. I might be contending with responsibility or empathy, and easily pick a book that will move me.