Mini SNES with Mario Paint. (I do have the SNES mousepad somewhere, but I think it’s buried under discarded Gundam parts.)
Something more recent: a pint-size replica Wii with Sin and Punishment 2. This is my favourite console miniature, because that tiny nunchuck analogue stick actually MOVES.
Also from the PlayStation History Collection: PSOne with Dokodemo Issyo. The memory cards come out and everything.