time_paradox
A chronologically impossible scenario, such as a character meeting their older or younger self, or two characters from different time periods meeting, even if one of them should be dead or shouldn't be born yet.
For example: Asahina Mikuru meeting adult_Mikuru, Revolver Ocelot meeting Major Ocelot, or Altair meeting Desmond Miles.
See also
* age comparison
* alternate universe
* anachronism
* Doraemon Darake
* dual persona
* time travel
Aliases: none