User blog comment:Askemeanything11111111/What team member deserves it's own game?/@comment-4835791-20120706083318

More seriously:

Kasumi/Thane would fit great for an infiltration game like Metal gear or the upcoming dishonored. With the cloak technology this universe has... man it would be great.

Liara also could be in a game similar to Tomb raider (searching for lost prothean artifacts) or in a game where she uses her resources as the shadow broker: Hiring assassins, turning down governments, ruining commercial empires...