I call this playthrough, 'I'm Commander Shepard and you will die' playthrough.This is a playthrough(only did it once) I did shortly after Citadel dlc came out.
ME1
when doing any side missions that can lead to the death of anyone I killed them all
kill Fist
talk with Conrad so he shows up in ME2
when scanning the keepers kill Chorban, Here's how
on Feros kill all the colonists and Shiala
I didn't help Rita's sister, Jenna
Noveria--have Anoleis and Gianna Parasini kill each other. Here's the video to do this. Kill the Rachni Queen
On Virmire, kill Rana Thanopolis and let Kirrahe and Kaidan die. Keep Wrex and Ashley alive
Kill Balak in Bring Down the Sky dlc causing the hostages to die
let the council die
ME2
On Omega make the Batarian drink his poison. Let the Patriarch die fighting the killers. When going to recruit archangel, let the kid join the mercs only to watch him be killed by Garrus a few minutes later. On Mordin's recruitment misson don't give medigel to the Batarian and when you encounter Mordin's assistant, kill the Batarians.
talk with Conrad
let Jack kill Aresh on her loyalty mission
let Garrus kill Sidonis on his loyalty mission
have Jacob's father die at the hands of his crew
let Mordin kill Maelon and save the data
On Samara's recruitment mission kill Elnora
On Thane's recruitment mission, don't give medigel to the salarian, push the merc out the window and on his loyalty missionkill Joram Talid
Jack, Kasumi and Thane killed because of no upgrades
Garrus died closing the door
Jacob was carried off by the swarmers
Sent no escort for the crew. They will die
Mordin killed as 2nd fire team leader
Miranda and Grunt killed fighting the terminator
After the suicide mission, kill Zaeed during his loyalty mission
Samara, Tali and Legion live to be in ME3
Do the Arrival dlc to kill 300,000 Batarians
ME3
have General Oraka killed
let Jondam Bau (the salarian spectre) die
don't talk to the female student on Grissom. She will die from her wounds
Conrad Verner dies because Jenna isn't there to help
Sabotage the genephage by shooting Paddok Wiks in the back. Don't do Turian Bomb causing Eve to die with other Krogan. Later on kill Wrex on the Citadel.
the Salarian Councillor dies because Kirrahe and Thane are dead
let Captain Aaron Summers kill the prisoner
on Rannoch pick the Geth(I could've made peace) letting the Quarians die and watch Tali commit suicide. Legion dies uploading the code.
let Anne Bryson die
shoot Brooks in Citadel dlc
let Samara kill herself and then kill Falere
let Oriana(Miranda's sister) and father die. Here's how to.
don't talk to Ashley when she's in the hospital, then shoot her and she will say "she hopes you go to he**". Here's the video. If you want to make it more interesting kill her while wearing Cerberus armor.
after saving the Volus Ambassador take the Volus fleet and ignore the Turian colony
don't talk to Steve, he will die in London
don't do the From Ashes dlc
let TIM kill Anderson
pick destroy causing the robot to fry along with the Geth
At the memorial scene I had Samantha, Joker, T'soni and James in attendance. I had over 3100 ems, so femshep isn't dead. On the wall I had both columns filled with names(48) and Anderson in the middle(49) and Kasuni and Zaeed were dead and their names weren't on the wall giving me 51 dead
I did a new game plus with the same charcter, but I went for low ems. James and T'soni were killed on the beam run(ems 1750-1900) and femshep dead when picking destroy. The memoral scene only had Samantha and Joker present. On the wall I had 50 names(including femshep) and 4 names not on the wall giving me 54 dead
If your ems is below 1750 the doors to the Normandy don't open.
That's what I did for that playthrough. Of course I could've done it different ways, but I'm content with this playthrough.