Aberration
Aberrations are alien creatures from another galaxy with strange mindsets and weird anatomies. There origins are unknown except to celestials and infernals who seem to prefer keeping that a secret.
Creatures with the Aberration typically also have the Fortification trait with the Strange trade-off applied to their Aberration type. They have at least one uncommon or rare language as one of their starting languages (usually Aklo) if they capable of language.