LAST EDITED ON Feb-25-17 AT 02:49 PM (EST)
 
>The middle one in the bottom row reminds me that I have long suspected
>Zer0 from Borderlands 2 of being some kind of renegade quarian
>ninja.
>

Good eye. One of the comments on the larger version of that design is:

"Tali actually looks like she's a cousin of Zer0 from Borderlands 2."