Unknowns

Unknowns is an umbrella term that refers to any and all manner of liminal entities that originated from outside of Remnant, or at the very least, exist beyond Remnant's mortal plane. Ozpin and Zodiarche are examples of Unknowns that exist beyond Remnant's mortal planes, while Imperium and Blazon are Unknowns that originate from beyond Remnant. Most also have the ability to just straight up HENSHIN, so that's pretty cool too, I guess.