(I'm doing that owl House being mermaid they're different types of mermaids so I might do a bonus of demon slayer like I did to my hero academia I hope you enjoy I hope it doesn't rain again)

(Mermaid 🧜‍♀️🧜‍♂️🧜
Bloom-a queen siren mermaid (black and orange tail)

Sapphire - princess siren mermaid (blue tail)

Ryan; sorcerer mermaid (tail color red)

Topaz: dolphin mermaid (white tail)

Toby - siren mermaid tail(purple and green)

Freddie - siren mermaid tail (black and red)

Christian: koi fish (white and pink mermaid tail)

Chole: koi fish (white and light blue tail)

Jessica - arctic and warrior mermaid on sapphire kingdom (dark blue mermaid tail)

Emma - princess of Atlantis (mermaid tail rainbow)

(They will turn into humans on land kiss help them to breathe on underwater true love kiss)

(Demon slayer they will battle demon chole is scared because she can't fight zenitsu make fun of her Yuri or tanjiro stop him an apologize for that

Jessica- flame breathing style (five forms)

Sapphire - water breathing style (11 forms)

Emma - love breathing style (six forms)

Ryan - beast breathing style (11 forms)

Topaz - flower breathing style (six and final form)

Freddie -insect breathing style (four forms)

Toby -wind breathing style( nine forms)

Chole-moon breathing style (16 forms)

Christian -serpent breathing style (5 forms)

(Bonus)
(Cosplay as sailor moon characters)

Sapphire - sailor Mercury
Jessica -sailor Jupiter
Topaz - sailor mars
Chole- sailor Venus
Emma- sailor moon