About Dan Heng and March7 SP
[Possibly Spoilers]

Aetiphia (March7) is more like Ishtar (FGO)
Delos (Dan Heng) is more like Zhuge Liang (FGO)

(In March's case, the personality of the one possessing her takes the lead, while for DH, it's himself who takes the lead)

#UncleGreekmilk
Thank you Sumimi for translate!