Is this a wish fulfilment team comp? I know the thread title said "realistic" but alot of people are posting full SSR teams, some consisting of characters that aren't even here yet so....
Anyway if it's the first, then my wish team comp would be:
Heroic Soul-
Takeda Shingen [Extra ability=Gawain's Ambush DEF debuff -20% A Frame] (Equipped with Fire lance) <-provides more Burst after using a Burst.
Main Eidolon-
Belial
Continued in the next post (because of the 5 picture limit per post)