What is the purpose of Renfield in Dracula?

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In the novel "Dracula" by Bram Stoker, Renfield is an inmate of an insane asylum

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Who is believed to be obsessed with eating insects, birds and other small animals.

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Renfield's madness is also used to create an atmosphere of unease and foreshadow the horror to come.

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The character of Renfield serves as a kind of foil to the vampire,

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Representing the human desire for power and control,

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While Dracula represents the ultimate embodiment of that desire.

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Renfield also gets a sense of comedic relief,

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Renfield is also the only one in the story who has a direct relationship

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