Silly idea I’ve been wanting to try out sometime. I’m sure I’m not the first to do this, so if my concepts are similar to another artists, its all coincidence. And a side note, these are not OCs or offspring of the ponies, but purely two ponies literally as one. Think steven universe fusions.
Party Animal (FlutterPie)
Speed Reader (TwiDash)
Fine Apple (Rarijack)
The hyperactiveness and shyness probably would cancel each other out. Or she would be sometimes shy and sometimes hyper.
But I could see her mainly being very bubbly.