Thread:NoFourthWall/@comment-1988716-20131015195608/@comment-28071061-20131015213149

Well at the very least UXP's should have these qualities:

- While there is speculation and theories on what they are, they have no canon backstory (unless it's in a certain person's interpretation) just like the Fears. As such, creatures like Thymos, Cockroach Jesus, and a bunch of other stuff aren't UXP's.

- They are creatures that would not work as Fears (like Poltergeists) or were established not to be Fears by their creators (Jack of All, The Crossroads of Trials, The Ne Timu, The Amalgam, etc.)

I'm sure other people have more to add and overall better ideas than me but that's all I can come up with at the moment.