Yall acting like just because Ooba has children doesn't mean she can't be trans lol. Queers all over the world have and raise children, even in places like Japan. You never know!
Yuka is definitely trans imo. They don't necessarily have to be a girl though, they seem like a "they"/"idgaf what you call me" kind of person.
While they're probably a minority, there's still a lot of trans people that to some degree identify with their ""bio sex"" even while not identifying...