Alright here's our list of interested parties and species claims:
Krogan: 3 (maybe 4)
Quarian: 1 (maybe 2)
Human: 2 (maybe 3)
Batarian: (maybe 1)
Turian: (maybe 2)

I actually have about 1700 words written up of background that won't be affected by the events of the game series for a krogan character, so that is for sure a submission I'm putting forward, although if absolutely need be, I could work on a turian character, although I have less ideas for him.