The idea is really simple and easily done: players who mastered their breathings to a certain lvl can make derivative breathings from their own for a certain amount of robux, the moves will deliver the same dmg as the players derived from breathing does, the player can name the moves as he likes, the particles will have a few options to choose from, you will be able to recolor existing breathing styles (for example water) to different colors, and the animations? you will get to choose from the other breathings except the particles will be replaced with your custom one, OR the devs could add a few animations for the players to use, for example:
i am a water user, i decide to make my own derivative breath called swamp breathing, i will then buy the gamepass and recolor the blue water breathing particles to green and reuse a mix of some flame breathing, serpent breathing, and water breathing for the moves then i will have my custom breathing which (like sun and moon) can be taught to other players, this will remove a ton of pressure from the devs to add new noncannon breathings for variety like they did for the BDA's and would create this fad among the community who will pass around their custom breathings
as i said earlier, this SHOULD be a gamepass imo+

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