ME1 - No one or Liara

ME 2&3 - Tali

Tali again

No one

Tali

Just to say something other than Tali... what about Jack?

That's a romance I never went for, so I could live vicariously through your experience lol.

Tali'Zorah

Tali 100%

Playing as a Spacer go with Tali

Playing a engineer go with Tali

Playing a colonist go with Tali.

Since we can relate on our homes being trashed and hating the people who did it.

Tali. Even in ME1, romance someone else, but harbor secret affection for tali.