If I can choose my history, I choose multiple choice!

Shepard's Background:

 

If Shepard had the Spacer Background, and completed Citadel: Old, Unhappy, Far-Off Things in ME1 by sending Zabaleta to the VAO:

 

Lieutenant Zabaleta served with distinction in the Reaper War, having conquered his Post-Traumatic Stress Disorder. Though still suffering from the occasional restless sleep, the Lieutenant stayed sober for the rest of his days, raising a toast of club soda to Shepard on the aniversary of Liberation Day.

 

If Shepard had the Spacer Background, and completed Citadel: Old, Unhappy, Far-Off Things in ME1 by setting up Zabaleta with an account:

 

Lieutenant Zabaleta, having conquered his alcoholism due to the assistance of Commander Shepard, proveded key assistance during the Reaper invasion of the Citadel. Eyewitness reports place his last known location in the docks, taking heavy fire from Reaper infantry as he provided cover to an evacuating shuttle.

 

If Shepard had the Earthborn Background, and completed Citadel:

Old Friends in ME1 by charming Finch:

 

The Reds were scattered in the initial Reaper invasion, but quickly used their knowledge of Vancouver's streets and layouts to establish vital trade and information routes  with fellow human resistance members. The individual known as Finch died aproximately four days before the liberation of Earth, his body discovered to have suffered a single self-inflicted gunshot wound, likely to avoid capture.

 

If Shepard had the Earthborn Background, and completed Citadel: Old Friends in ME1 by intimidating Finch:

 

The Reds proved a hardy group of supply runners for the human resistance. In the aftermath of the war, Vancouver was able to recover much faster than expected, due to the safehouses and supply catches the Reds had established across the crumbling cityscape. The individual known as Finch died aproximately four days before the liberation of Earth, his body discovered to have suffered a single self-inflicted gunshot wound, likely to avoid capture.

 

If Shepard had the Colonist Background, and completed Citadel: I Remember Me in ME1 by convincing or forcing Talitha to take the sedative:

 

In the intervening years between her enrolement in therapy and the Reaper Wars, Talitha made great strides, quickly overcoming the trauma of her tortured past of slavery. Escaping to a remote colony in the Terminus systems when the Reapers arrived, Talitha managed to escape most of the horrors of the Reaper War. When news of the Batarian Hegemony's destruction came, she let herself smile, just for a moment. The nightmares were gone, replaced with dreams of a safe place, where she could feel no pain, wrapped gently in the arms of her savior.