Is she bi? I'm struggling to think of any male romantic attachment she's had, or any attraction she's expressed that wasn't towards a woman.
Edit: Yep, got it, lots of examples here, thank you!
When Mariner and Tendi try to enlist the help of Tendi’s cousin to repair a damaged totem for the doctor, Mariner remarks about how attractive Tendi’s cousin is, and says she has a thing for bad boys, bad girls, and bad non-binary’s.
You seriously haven't noticed how extremely mad at herself she gets every time she notices that Ransom's hot?
She gets mad horny whenever Ransom has his shirt off, then gets angry at herself for it
Well I hope she is, because I'm shipping her with Ma’ah so freaking hard. And if not him specifically, I've seen all I need to believe there's a Klingon somewhere that's her soulmate.
Mariner fucks who Mariner wants to fuck. There's so much variation in alien genitals it's impossible to have only two options.
Don’t forget about Nurse Chapel! They mentioned some of her previous male and female dates in Strange New Worlds.