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The only problem I remembered was that Rain is Dark Blue, and Glacier Flame is Light Blue.
So the Ocean Flames might be limited in terms of colouring but we could give this a try.
Orange-Sky, Red-Storm, Blue-Rain, Indigo-Mist, Yellow-Sun, Green-Lightning, Purple-Cloud, Very Dark Orange-Earth, Light Blue-Glacier,
Desert, Swamp(Most pathetic name for flame), Mountain and Forest not yet confirmed.
Ocean flames will have a hard time picking flame colours lol.
Since Kawahira explained that he is one of the "original species" of Earth, it could be possible that there would be some.......cough.......time travel?
Before Tsuna can become Decimo (or not), he has to fight Primo. This should be only conclusive arc in the story I can think of. All of my previous suggestions are just that.
Vongola Vs. Vindice
Vongola Family Cold War