User blog comment:Nadreas/Story Units: Seria, Lugina, Paris, Eriole etc./@comment-27691408-20160420234551

The game explains it. Noah artificially creates the mock units based on the information he gathers on each of the people that the units they represent.

Mirafah also says things about a Roah mock unit so I'm unaware if he is a mock unit or regular one.