4girls, 6+boys, ahoge, air_bubble, aqua_hair, barefoot, blonde_hair, brothers, brown_eyes, bubble, closed_eyes, fins, freckles, hair_ornament, kriss_sison, long_hair, male_swimwear, mermaid, monster_girl, multiple_boys, multiple_girls, peter_pan, peter_pan_(character), pointy_ears, purple_hair, scales, shell, shell_bikini, siblings, smile, swim_trunks, swimming, tail, topless_male, twins, underwater