Liara T’Soni
Just because Liara is the player’s first real romantic option with another species in Mass Effect, it doesn’t make her any less of a good choice, regardless of the sex of your Shepard.
Alongside being witty, kind, and a hell of a powerful biotic, Liara offers a ton of insight into the universe –thanks to the fact that she is 106 years young.
Liara also has the benefit of being one of the few romantic options that is around throughout the entirety of the series. Her continued inclusion throughout makes for a lot of nuances to her and Shepard’s relationship.
The couple can either stay together throughout, break up partway through, and even back together at the end. Shepard can even bring up the possibility of having little blue babies and settling down, causing Liara to open up about how much she worries about losing them again.