Which one?
Someone who knew wouldn't have to ask.
There have been great ones over the years some of which no one or very few knew were gimmicks.
No. There haven't.
Sorry but it's usually some dumbfuck who thinks morphing a name is an exercise in cleverness or having an argument with himself on the internet. It's always fucking stupid and I've only once ever seen one that actually displayed any creativity. People have done gay shit like naming an alias after someone's dead pet and thought it meant they were smart, LOL!
We've also had fat fags pretending to be a women on GetBig and then claim it was cool. I mean really, you're having a homosexual on-line relationship with a socially inept dude and think that's an owning? it's fucking gay and only someone who loves (and lusts after) the cock could even pull that off. If you're gonna be gay, be that way and happy... don't do it online and pretend it's not the real you.

There has only every been one consistently funny gimmick on GetBig, period. There have been one or two funny moments with gimmicks but not enough to justify the amount of utter garbage they've contributed overall.
Funny and ironic are not the same thing. Funny and ironic are not the same thing. I typed it twice so maybe someone would get the point. Having a conversation with yourself on the internet is the opposite of funny.

Hope that helps.