My DLC Idea:
Ultimate Normandy
A small DLC (maybe 5 bucks) that would expand the Normandy. A new scientist would make a Lab on the CIC Floor, which would upgrade the Normandy, increasing it's War Assets for EMS (It is different depending on what you do).
Also, have the option to bring Kelly Chambers back on board. Have a mission to help her get over her fears after the Collector Assault, and then she works on Floor 3 helping everyone out.
*Mess Sergeant Rupurt Gardner- You could recruit him from a Spectre Terminal.
*A Refugee Support Area- This would be where Grunt used to be. Some civilians would help out the cause by actively working on the ship, or maybe even a civilian militia.
*Loyalty Missions- Not in the sense that they used to be in, but instead helping out your squad. Here are the examples:
GARRUS- Help Garrus save his family on Palavan
JAMES- Take James to see his Uncle on Earth... Yes Earth!
*Crew Support Missions- When Traynor talked about the Toothbrush, I hoped it was time to start getting crew members stuff. I want to help out my crew, it is the end of the world, may as well help 'em out!