User blog comment:Killerkidzz78/New DLC ideas?/@comment-1388547-20120724035300

I'd enjoy some side story DLC, similar to Leliana's Song in Dragon Age -- particularly something covering how Liara dealt with Cerberus when they came for her on Hagalaz, with her as the playable character. Feron could be along as a squadmate, and if we needed a third member in the squad, maybe Liara could weaponize Glyph. You could have it give the player a new bonus at her intel terminal as a reward -- explain it as something she remembered while recounting the tale. Call the mission, "Flight of the Shadow Broker."

It would be nice to have similar side stories from some of the other characters -- Garrus' actions between the start of the Reaper invasion and when he meets up with Shepard come to mind -- but I don't think any other squadmates are guaranteed to have survived to ME3 besides Liara. They could do a flashback to Vega's mission that went sour, but Vega is boring.