Beings from other dimensions, realities, or such where even the laws of nature may be alien.
Alternate names: Extradimensional beings, Extradimensional creatures
The first video game about Outsiders was released on July 15, 1997.
Electronic Arts has published all these games
* Demons, Angels - should normally be treated as separate of this tag
* Bizarre creatures
* Extraterrestrial creatures
* From another world / Outsider protagonist
* Space aliens
Generally this should NOT be used for demons and angels as they're a very specific and extremely common kind. Undead shouldn't be covered by this either, even if it somehow would make sense (in Legacy of Kain series this would make some sense, for example, mostly with Raziel, though).
These shouldn't be tagged with aliens either, as that is more for the space alien kind.