Hi......
fictional (adj) 1. consisting or suggesting fiction
2. related to or involving literally fiction
3. formed or conceived by the imagination
"I like fictional literature."
"That was a fictional treatment of the train robbery."
fiction

= - literary work whose content is produced by the
imagination and is not necessary based on fact
- an imaginative creation or a pretense that does not
represent actually but has been invented
"He is a fiction writer."
ficticious = fictitious = created or formed by imagination
untrue, made-up
antonym: actual, certain, factual, genuine, proved, real, truthful
"The accounts he gave of his movements is quite fictitious."
A fictitious name is an assumed name that differs from an individual's actual name. For example, both "Delmobile" and "Amigos4", are fictitious names of two respected from me individuals.
Regards.
V.