>>99538193It can depend on the character. Like Simone from Dofus has shown zero interest in guys but gets starry eyed about her girlfriend, so it's possible they're lesbian.
Kat's a little harder to pin since while she was boy mad and had a boyfriend early in the comic, she seemed to stop for a long while after seeing those tapes of Jeanne. Some actual lesbians in the fandom have said they were just like Kat and switched gears when puberty happened.
Personally, I see Kat as the definition of pansexual. Past the worries of seeming weird to other people, she doesn't mind what gender her partner is. She just loves them as a person.