Vixen (Arrowverse/DC Comics)
Dolphin (DC Comics) sustains her respiration serenely underwater.
Like any aquatic creature, Ichthyosaurs (Hλlf-Life series) can breathe underwater, especially if they are in the kind of water that’s found on the planet Earth.
Alex (Heroes), right, is fine underwater as Claire holds her breath.
Dillan breathing underwater
Harry Potter swallows Gillyweed in the second task of the Triwizard Tournament to grow gills and fins.
Aquatic mobians (Archie's Sonic the Hedgehog)
Air Charm (Archie's Sonic the Hedgehog), a mystical necklace that allows air-breathing mobians to breath underwater.
Nessies (Happy Ness: The Secret of the Loch)
Super Commando Dhruva (Raj Comics) can breathe and even talk underwater.
Gills of Hamachi (Xiaolin Showdown) allow the user to breathe underwater plus giving the user fish-like appearance and movements
Kevin 11 (Ben 10) possesses Ripjaws' underwater breathing.
Ultimate Aggregor (Ben 10: Ultimate Alien)
Ultimate Kevin (Ben 10: Ultimate Alien)
Piscciss Volanns (Ben 10 series)
Aerophibians (Ben 10 series)
Pyronites (Ben 10 series)
Big Chill (Ben 10: Alien Force)
Ultimate Big Chill (Ben 10: Alien Force)
Water Hazard (Ben 10: Alien Force)
Using Poseidon's trident, Kratos (God of War series) can swim and breathe underwater indefinitely.
The Mariner (Waterworld) can breathe underwater, thanks to a set of gills behind his ears.
Sea monsters (Sofia the First)
Godzilla (Godzilla) can survive on land and water.
Pearl of Transformation (My Little Pony: Friendship is Magic), a magical pearl that can transform hippogriffs and ponies to seaponies and various land creatures to various sea creatures.
Sirens (My Little Pony: Friendship is Magic)
Xever Montes (Teenage Mutant Ninja Turtles 2012 TV series)
Flora, Bloom, Stella, Musa, Tecna, and Aisha (Winx Club) can all breathe underwater while in their Harmonix and Sirenix forms.
Princess Marisa (Elena of Avalor)
In addition to being adaptive to both surface and aquatic environments
, Fishmen (Serious Sam) can breathe underwater, as well as breathe outside it.
Jonathan Rook/Stretch Monster (Stretch Armstrong and the Flex Fighters)
Princess Merliah (Barbie in A Mermaid Tale)
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Vela (Jet Force Gemini) possesses cybernetic lungs, allowing her to breathe underwater.