Millicas Gremory/Relationships

Sirzechs Lucifer
Sirzechs and Millicas has a good relationship with one another evidence by the fact that they always play together during Sirzechs' free time. This is resulted in Sirzechs' near depression and deep jealousy when Millicas chose Oppai Dragon over Satan Red.

Grayfia Lucifuge
Grayfia and Millicas has a good mother-son relationship. Grayfia loves her son dearly but is strict with him due to his status as a Satan's child and because of the special environment Millicas lives in. Millicas on the other hand tends to call Grayfia "mother" even when she is on duty as a maid.

Rias Gremory
Millicas treats Rias as a sister figure despite Rias being her aunt presumebly due to the small age gap between the two and is shown to constantly call Rias "Onee-Sama" which means older sister. Rias also cares deeply for Millicas

Issei Hyoudou
Millicas has admire Issei since the day they met, calling Issei "Nii-Sama" which mean older brother. In fact Millicas' closeness to Issei is displayed when he chose Oppai Dragon (Issei) over Satan Red (Sirzechs).

Akeno Himejima
Millicas and Akeno is shown to be somewhat similar to that of Millicas and Rias as shown when he called Akeno "Onee-Sama" a term which he only used on Akeno but not on Rias' other servants.