~Villagers of Frost's Cape~
at least 3

~Greencloaks~
Greencloak leader (main)
The rest will be supporting or background

~Dragon Riders~
Descendant of Lily and Kol

Descendant of Kumaglak

Descendant of Nimue and Siku

Descendant of Kailani and Moray

Descendant of Onyx and Daxel

Descendant of Kali

Descendant of Aisha and Samuli

Descendant of Monique and Lukas

Descendant of Alexia and Blayde

Not every single one of these descendants will be main. It depends on how well they are written. Other than that, they will be supporting characters.

~Children of Rhamnusia~
1 main
The rest will be supporting or background

~Dragons~
1 main
The rest will be supporting and or background
Royalty is open

~Unaffiliated~
1 main
Those that choose to stay out of the war and left the Greencloaks and Dragon Riders

~Other~
If you want to make characters aren't any of the above and are citizens of a continent, or like Royalty, go ahead. Depending on how well the character is written, they may be supporting character. Otherwise, they will all be background.