Quotes / Shapeshifter Identity Crisis

So many times has the Changeling altered his appearance and shape that even he has forgotten what his original form was, and so when not in the guise of another being, he cloaks himself in a long shroud from the gaze of others. It is whispered by Tzeentch's other Heralds that beneath his cowl, the Changeling is in a state of constant flux, randomly changing between all the faces he has assumed in the vain hope of rediscovering his original features. However, only the Great Schemer remembers the Changeling's true form, and he keeps the secret for himself so as to forever keep the Changeling under his control.

— Warhammer 40,000: Codex - Chaos Daemons

SpongeBob: Who am I?
Fish!SpongeBob: I have a right to know!
SpongeBob: Who am I? Am I friend
Plankton!SpongeBob: or foe?
SpongeBob: I have so many features, it makes it hard to tell.
I don't know what my first name is, but my faces ring a bell.
Squidward!SpongeBob: Who am I?
Mr. Krabs!SpongeBob: Who am I?
Patrick!SpongeBob: Who am I?
Plankton!SpongeBob: Who am I?
SpongeBob: Who am I?
*SpongeBob's hand, transformed into a telephone, rings*
SpongeBob: Hello...
Caller: Hello. To whom am I speaking?
SpongeBob: I don't knooooooow!

— SpongeBob SquarePants: "Mimic Madness"

David Rossi: CIA assigns an agent two or three aliases at most. Any more than that, and it's difficult to keep the names straight.
Spencer Reid: This guy's juggling 10.
Rossi: Being all these people has got to start fracturing him somehow.
Reid: If his memory is strained, it could be causing him to lose control.

—Criminal Minds: "Parasite"