In a fictive manner.

Having the characteristics of fiction: fictional. / Resulting from imaginative creation: fanciful or invented. / Being feigned, ingenuine or unreal.

(Internet slang) In claimed cases of dissociative identity disorder: an introject based on a character from a fictional work.

plural of fictive

The quality of being fictive.

The state or condition of being fictive.

(anthropology, ethnography) Someone who, though unrelated by birth or marriage, has such a close emotional relationship with another that they may be considered part of the family.