Liara: Kristen Bell Ashley: Emily Blunt (or sandra bullock! ash looks just like her) FemShep: Isla Fischer Garrus: Zachary Quinto (heard this suggestion elsewhere, liked it. altho i'd be okay with Keener & a good costume too!) Miranda: HAS to be Yvonne! Chakwas - hellen mirren? YES Many of the characters should be played by their voice actors, IMO since they were modeled after them anyway!