Fics like H2O Phantom Adventures.

In Dolphin City Rikki was happy she would finally get a chance to meet Danny Fenton, her pinpal of Ten years, little did she now, he had his own supernatural secret. One sixteen year old is a Mermaid, one sixteen year old is a Ghost, together they are about to have a big adventure, filled with ghostly villains and the supernatural nature of the ocean.

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  3. Galactic Shift Extend by GammaTron, KamenRiderZER0, Seanzilla1988 (Ben 10 Series, BlazBlue, more)
  4. Finding Home by JBGilroy (Young Justice (Cartoon), Danny Phantom)
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  6. Phantoms and Harmony by jboy44 (Danny Phantom, My Little Pony Generation 4: Friendship is Magic (Cartoon 2010))
  7. To Make You Mine by HotMolasses (Batman - All Media Types, Danny Phantom)
  8. A Devil's ghost by Fanreader62 (Danny Phantom, Highschool DxD (Anime))
  9. Secrets kept by maybemusing247 (Danny Phantom, Batman - All Media Types)
  10. Chatting All Titans by WaltzoftheWifi (Danny Phantom, Teen Titans (Animated Series), more)
  11. Just add Water? by rylandgraceglazer (Project Hail Mary (2026), H2O: Just Add Water, more)
  12. Let My Demons Die by Hazama_d20 (KPop Demon Hunters (2025), Danny Phantom)
  13. The hunted Oceans by Arosafee (Danny Phantom, Red Robin (Comics), more)
  14. Messages Across The Void by AliasEinzwerthos, AzemTheEverRecording, Narvgana_The_Void_Phoenix, Pestilence36, SonictheJedi2013 (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), Toriko (Anime & Manga), more)
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  16. His Mermaid || Edward Cullen by MerLynn97 (Twilight Series - Stephenie Meyer, Twilight Series - All Media Types, more)
  17. Welp... We've Seen Weirder? by Cy_an_Blue (Batman - All Media Types, Danny Phantom)
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  19. Ghosts and Alicorns. by jboy44 (Danny Phantom, My Little Pony Generation 4: Friendship is Magic (Cartoon 2010))
  20. I Was the Ghost King in My World Now I'm the Demon King in This One! by apprehensive_child (Danny Phantom)