Rikki-tikki
The main character, the hero, the protagonist. He is good, brave, helpful, quick, clever, and curious.

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Nag
One of the main antagonists. He is an evil foil.
Nagaina
One of the main antagonists.

She is an evil foil. She's devious and protective of her eggs.

Teddy
This character is helpless and unaware of dangers, but is very kind and warm-hearted.
Teddy's parents
These two characters are kind, protective, helpful, worriers, and also a bit unaware of dangers.

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Darzee
This character is afraid to act but willing to help. He is also extremely dumb.

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Chuchundra
This character is wimpy, inactive, and fearful. He is unwilling to help himself or others.
Kurait
This character is a minor antagonist. He is also evil. He's silent, but deadly.
Darzee's wife
This character is clever and pretty brave.