The main characters are:

Speed, a male Jolteon Flare, a male Flareon Crystal, a female Vaporeon Sunshine, a female Eevee Pearl, a female Espeon Black, a male Umbreon Leaf, a female Leafeon Lazuli, a female Glaceon Sylvia, a female Sylveon

Choose to be one of them or just use your own character. Have fun.