Linda: Bi
Mia: Lesbian
Emily: Bi
Alice: Bi
Oreo: Everything
Ri: Bi
Jane: Bi (leans lesbian)
Chahiro: Still Discovering
Seraph: Bi
Leo: Bi
Terra: Straight
Tiaco: Straight
Xiik: Straight (for humanoids)
Sandy: Bi
Grape: Straight
Lisa: Bi
Florence: Straight
Daliah: Fluid
Yari: Straight

That covers most of my main characters.