I almost want to enter as a rather tongue-in-cheek character...

A reality-warping entity from modern fantasy...
With powers that rip apart the very fabric of the world...
A being that exists upon dimension beyond the understanding...
Like how a three dimensional object ripples the two dimensional world...
Now from the higher plane, far secret and deranged, manifests the manifold...
The Singularity that is known as...

Mitchell.

Mitchell, who with fingers at the keyboard, writes himself into existence, a hero of his own tale, the playwright turned actor.
And uses the complexity of fourth-wall interactions to mock the very nature of the game he was invited to play, leaping from OOC to IC as easily as navigating the webpage. And there Mitchell writes the infinite recursion of how Mitchell controls himself.

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Presented as an average human male in the roleplay, who roleplays on the RPG and uses the RPG to puppeteer his own actions. Erasing mistakes by post edits, escaping into the OOC to avoid IC issues (at which I'd actually have to post that Mitchell is posting on the OOC in the IC...) and all sorts of whacky Roleplayed roleplayer roleplaying a roleplayed roleplayer roleplaying the roleplayed roleplayer.