ryuko is already in a threesome with a sailor fuku and an idiot, technically, it's only not one because the uniform is fucking dead

setsuna has exactly one romantic bone in her body and it belongs to love momozono and that's that

saber alter is ... you know what her sexual appetite terrifies me but i don't think she feels love so calling it that would be a mistake

ibera probably would like multiple people but she's an operator and i'm pretty sure their entire emotional spectrum sublimates itself into the act of murder so unless your name is MCU peter parker who is excused on grounds of "too much of a cinnamon roll" probably avoid this possibility

the sword of heaven has a wife, a mistress, and lots of other girlfriends and she will flirt with even more for a one night stand or a two night stand or a friends with benefits situation because she is incorrigible and shameless

my characters usually have two settings

winsomely adorable and in love with exactly one (1) idiot

or "that's a woman in a sharp suit with the face of an angel and the morals of a chainsaw"

and the latter almost by default does not stop at loving, to say nothing of bedding, just a single individual person

sometimes the two settings overlap and then you get characters like the sword,