I like the word "Leitmotif" for the way it sounds, but it's really up to you as far as a name goes.

I think Allegro Sonata and Allegretto sound the best and the most musical as far as the choice of names go (which are very good choices).

We are supposed to be giving you our opinions, right?

Well, I can't choose myself.

I was leaning towards those, too, though; now, which one to choose... :\

Allegro Sonata as his normal name and Allegretto as his stage name.

Much like Vinyl Scratch/DJ Pon-3.

...

That is an amazing idea.

You're welcome. ^,^