Who said "Say—who is you? What is you?"?

This quote is attributed to Jim.

Say—who is you? What is you? - Jim

"Say—who is you? What is you?"

Jim

Character in The Adventures of Huckleberry Finn

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"I's rich now, come to look at it"

"Jim don't hurt nobody"

"Goodness gracious! is dat you, Huck?"

"There's a time for all things."