However , as her brother Shark knows , she is actually quite irritable and stern .
Rio is initially shown to be a polite girl with charming looks and great athleticism that earn her attention from her classmates ( especially Bronk , who develops a crush on her ) .
As girl 's brother Shark knows , girl is actually quite irritable and stern .
Rio is initially shown to be a polite girl with charming looks and great athleticism that earn her attention from her classmates ( especially Bronk , who develops a crush on her ) .