I use this set-up for every team, and was just wondering if I should tweak anything.

Main: Highest elemental atk that I have.

Support:
Kaiser (Tiamat if I don't have Kaiser for that element)
Yamata no Orochi (Tiamat if I can hit the cap w/o Yamata)
Fafnir
Adramelech
Jormungandr