Aria has also been involved in various comics and what not. She's a bit more fleshed out than most characters.

I would be a lot more interested in this if it:

A) Added the two extra companions permanently, instead of simply during the Omega mission.

And/or

B) Added the Omega station as a permanent new hub once you completed the DLC mission.

That's where DLC has the most potential in my opinion - truly expanding upon an existing foundation, instead of just adding separate missions.