Edit
A "squad" from Goddess of Victory: Nikke.
Traitor Nikkes who fight for the Raptures and their Queen, hybridized with Rapture technology and armor to serve as her agents. Throughout the Rapture Invasions, many Heretics form their own subfactions:
Offspring
A group of Heretics with unknown goals. Named after various philosophies or ideologies.
Four Beasts
Four Heretics named after mythological creatures in the Bible. They are Heretics with different goals from their kin, however, the Four Beasts hold a grudge against the Offsprings for disregarding them.
So far Modernia is the only Heretic that is not yet confirmed to be in any Heretic factions.
1