Team building isn't an amazing science. See a debuff you don't have? Pick it. Got a healer? Pick it. Got space left? Put whatever has the highest base damage, so probably a random SSR/SR.

So, based on an entire five seconds that I spent looking at that list, fire:
Mars (debuff), Heph (debuff), Raguel (debuff), Bryn (heals). Replace Bryn with Ares if you're running content that doesn't require heals.
Soul, bring B debuff and/or BP (you might need to run Konohana-Sakuya if you need both). Mordred is always a good go-to Soul until Hercules Relic weapons.

Light:
Raphael (debuff), Diana (debuff), Metatron (damage), Belebog ("heals")
Replace Belebog with your favorite SR if you don't her "heals."
Soul, bring B debuff and/or BP. Mordred is always a good go-to Soul until Hercules Relic weapons.