* You start as a prisoner
* You have a peculiar power within you
* Lose consciousness and start on a beach
* One companion has been close with a devil
* One companion is undead
* One companion starts by holding a knife to your throat
* One companion is in love with someone else
* One companion is known by a legendary callsign or alias
* One companion is hellbent on revenge and wishes to redeem themself
* One companion seems to hear voices and has mystical influences they don't understand
* Barrels everywhere
* Surface effects everywhere
* Weird thing in multiplayer where another player cannot interact with a companion that happened to be picked by someone else to join


... and lots more.