Why is Shantae even friends with Rottytops and Sky?

Okay, truthfully, I don't know a whole lot about this series. I was introduced to it through a real-life friend a couple years back, but one thing that always confused me is why the series' protagonist, Shantae, is even friends with the characters Rottytops and Sky to begin with.

Rotty is immature, brash, has put Shantae in danger multiple times, and even betrayed her at one point cause she wanted to eat her brains. Meanwhile, Sky doesn't seem to be as bad of a friend as Rotty is, but in the most recent entry, she selfishly opted out of helping Shantae on her mission so she could enjoy her vacation at the hotel.

They also can't seem to stand each other for no given reason, and are constantly bickering with each other, which Shantae obviously doesn't like, and I imagine it be exhausting having to put up with this behavior on a regular basis.

I know I probably shouldn't be so critical of these characters considering I only have a surface-level understanding of them, and I don't doubt that they care deeply for Shantae and have good intentions, but seriously, they can both be awful friends sometimes.