?

This thing has no known name (I know it's name but you guys don't)

It's unlockable in each game of the series.

It's stats are perfectly balanced. Other than that absolutely nothing is known about it. Nothing. You can ask a million questions about it and they will never be answered. What gender is it? Why does it look like a Shroobified Pikachu? Is it good at Guitar Hero? What about Dance Dance Revolution? Is it thinking right now? Does it have a soul? Will these questions ever end?

Date of drawing unknown.