Which main character has changed the most over the years?

[E.V.I.L]

I voted for the sponge for the same reason everyone else did. He is still a likable character, but he's gradually become more of an immature loud little boy. I wish they could go back to his voice being low but high at times. That is the main thing that annoys me about him, how Tom Kenny decided to raise the pitch. Patrick has changed as well, and Mr. Krabs, but I feel that Sandy, Squidward, Plankton, etc have not changed that much at all. But SpongeBob has changed the most.

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Squiddy and Plankton haven't changed that much, but Sandy changed personalities and interests IMO. Atleast SpongeBob stays true to what he likes. :P