Answer:
Rikki-Tikki
Step-by-step explanation:
As the name suggests, Rikki-Tikki is the protagonist of the story which is part of the Jungle Book anthology. Rikki-Tikki is the Indian grey mongoose and the story follows his adventures as a pet.
Teddy is the boy in the family that takes care of Rikki-Tikki. Darzee is a tailorbird that lives in the garden and who Rikki-Tikki befriends. Nag is the cobra about whom is Rikki-Tikki warned about, and they end up fighting. These are all the side characters that accompany and add up to Rikki-Tikki’s story.