I'm amused that Karin just making her own clan is both the correct choice and the most chaotic one.
After all, whatever clan she joins will immediately become the nation's top clan, but would make her subordinate to someone else.
Making her own clan means no one is the boss of her, but also casually overturns the hunter clan hierarchy, since she just as good as declared "I'm in charge now."
Though the obvious question is "can a minor even create a clan?" Either the answer is "no" or whoever wrote the clan laws didn't even think of this as an option and there's a loophole for now.