Dr. Peter Lankton

Doctor Peter Lankton is Plankton's alter ego, a cheerful and goofy therepist, and the main antagonist of the episode Fear of a Krabby Patty.

Looks

He is just Plankton with black buttoned yellow suit, black pants, laced black shoes, and a Brownish grey beard.

When he changed the Chum Bucket to his office, he became Peter Lankton and he was trying to get SpongeBob to tell him the Krabby Patty Secret Formula.

His name is Peter Lankton, often shortened to P. Lankton, which is Plankton.
His name P.Lankton could be a reference of Dr. Acula, which appeared in Fanboy and Chum Chum. Although, Fear of a Krabby Patty aired before any episodes of Fanboy and Chum Chum.
He is probably the only character with shoes apart from Spongebob, Gary and Patrick, (Patrick has shoes but puts them on his hands in the lack of Spongebob forgetting how to tie his shoes.)
Obvious reference to Dr. Peter Venkman, Psychiatrist from the Ghostbusters movies played by Bill Murray.

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Alter Ego