I wouldn't say alter ego, but I do use this name pretty much everywhere on the web, especially for everything rap-related. It's kinda like an extension of self

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Fee Fi Fo Fum, now bitch I'm a giant
And your ass is like Jack, but your magic beans is wack
Skills is what you lack
I'm like a Benz, you ain't even like a Cadillac
Ya more like a Reagal
I'm a pittbull and you's a beagel