“They call me MISTER Tibbs!”
I’m the Doctor
:“Who are you?”
“Your worst nightmare.”
“I’m just Ken.”
“My name is Maximus Decimus Meridias, commander of the armies of the north, general of the Felix legions, loyal servant to the true emperor Marcus Aurelius, father to a murdered son, husband to a murdered wife, and I will have my vengeance, in this life or the next.”
I’ll grant that’s iconic, but also a bit long-winded, to be frank (not a dig at you, just the writing).
“I am Groot.”
“I am a shrubber. My name is Roger the Shrubber. I arrange, design, and sell shrubberies.”
“Who am I? TWO! FOUR! SIX! OH! ONE!”
“I am the terror that flaps in the night! I am the [noun] that [verbs] your [noun]! I am Darkwing Duck!”
That was the one I immediately thought of, but I was sure someone else beat me to it. I’m honestly surprised it took five posts before someone posted it.
Since that’s already taken, “I’m Arthur, King of the Britons!”
Alexander Hamilton
My name is Alexander Hamilton…
“I know who I am. I’m a dude playin’ a dude, disguised as another dude!”
“I am serious. And don’t call me Shirley.”
“Once again, I am free to smite the world with evil as I did in days long past.”
by Aku, series, Samurai Jack.
I am the genie of the lamp.
Aladdin, of course
It is pretty much a given one is going to hear a lot of “I am… the destroyer of worlds”, “I am Alpha and Omega”, “Ego sum… flagellum dei” and that sort of thing.
“Oh that’s alright…he can call me a flower if he wants to. I don’t mind.”