I remember being so happy to see Mordin in ME2 trailers.
+ Wishlist : vorcha, batarian for a complex squadmate.
+ Unrealistic? : volus, rachni
+ Technically hard to do but show us some some cutscenes of them fighting : elcor, hanar, yahg
+ as a pet : pyjak, varren (like a space barkspawn)
With Garrus of course! I know people hate Jacob and most people recommend bringing Garrus with Miranda/Grunt/Mordin. With the references to Eden Prime, it's nice to hear Jacob's experiences with the husks and he has a nice dynamic with Garrus!
Near the beginning of the mission on Purgatory. This technician trying to stop shep and crew alone always cracks me up. Reminds me of the technician you one-shot in Jedi Survivor