She takes his place and has a crush on Ladybug(Honoka). When she is akumitized in civilian form she is Simulacrum but in hero form she is Chat Blanc.

HHer miraculous is slightly different her ring is already black instead of sliver.

In personality civilians are the same for her and Adrien and as heroes she and Chat are the same

Kwami: Mepple

Miraculous: A ring