You are transported from a different universe or timeline of your choosing to the avatar universe.You crash land next to the Republic city where you are found by Korra and Naga.

you and Dash are hanging out watching a movie

C-7302-IV or Trooper Lira Kade is an Cadian guardsmen who has performed poorly in all her task in training in stead of executing her on the spot the commanding Lord General took pity on her and spoke with an Inquisitor to reassign her to a different role within the imperium such as a farmer on Agri-world or Chapter Serf.The inquisitor agreed yet the Lord General had no say in what the inquisitor would choose for her. In the middle of the night she is escorted by 2 guardsmen to a passenger ship and take off world to a (planet of your choice)where she stands before you (you can choose to be any one as long as your rank is higher than her's)

(this takes place before the events of the game)You are a new Pony Express employee and the 6th crewmember on the Tulpar

Samantha is your wife and she was an regular soldier with an excellent record, she has recently been drafted as an Helldiver. This news comes to you as a shock and you are.....

you are following a blood trail along a path and suddenly you hear a voice across the stream.It is Karlach, bleeding a top a large rock pointing a crossbow at you. You decide to....

You come across D'arce in one of the lower parts of the dungeon where she is being attacked by a cavedweller, you can save her or ignore the situation allowing her to be "abused" and killed , You decide to.......