Blue Fest. King (Full Wing): For the shield and to convert buffs to debuffs on enemies.

Blue Fest. Luciodel: For damage reduction and damage increase, further helping my team tank enemies' attacks.

Red Gowther: For rank ups and attack seals

Red Purgatory Ban: For BIG damage on green enemies with max hp damage.

ASSOCIATIONS:

Sariel is for King because of the Grace that ignores 50% of crit defence

Tarmiel is for Ban because of the healing.

King for Gowther for the ultimate.