I cannot remember everything, so I'll have to reload the very last game of each playthrough from Origins and II.
Some things I remember I always do:
- My Wardens (thus, all my Warden Commanders), Dog, Leliana, Morrigan, Oghren, Shale, Sten, Wynne and Zevran all survive - even in my Chaotic Evil playthrough (because roleplay - although, she only really liked Dog and Zev).
- Anders, Nathaniel, Oghren, Sigrun and Velanna all become Grey Wardens, and all survive (and Mhairi dies).
- Aveline, Dog, Fenris, Isabela, Merrill, Sebastian, Tallis and Varric all survive (Anders doesn't always live - dies twice).
- Morrigan isn't romanced. 
- Sebastian isn't romanced.
- Isolde always survives (but Connor doesn't - he dies once).
- Side with the Circle Mages.
- Stop Anders from killing Ella during his Dissent personal quest.
- Probably killed Decimus.
- I'm pretty sure I never (in imported playthroughs) side with Branka.
- Hardened Leliana and/or Alistair.
- Hawke defeats the Arishok, and Isabela stays.
- Friendship with Merrill (and possibly Varric and Isabela).
- Rivalry with Fenris (even though I romanced him once).
- My Wardens and Hawkes always sleep with at least one companion, and always romance at least one companion (only romanced Anders and Tallis in one game, every other time, I romanced only one person - however, I killed Anders in that game because I sided with the templars (although I did get Velanna and Justice to 100 Love in my CE origin, LOL)).