Ultimately, I am myself, because while I can roleplay others, I don't see the need to. I possibly adhere to a slightly more formal sentence structure, but I use "ten dollar words" IRL as much as I do online. I've been using "big words" since I was barely more than a toddler, I've always been a spelling/grammar Nazi, and I've always been intolerant of stupidity (although I rarely feel the need to swear when pointing it out. Being polite is far more infuriating, and less likely to a) get me punched in the face, and b) get me banned from forums I like.)
I possibly put on less of the "flashy light show" I use to distract people from my core self IRL, but returning to my original sentence, ultimately, I am myself.