What are the good things Rikki-Tikki-Tavi does in the story?

Rikki-Tikki-Tavi does a number of good things in the story. As the main protagonist, Rikki-Tikki-Tavi proves himself to be an altruistic hero. For example, after he is rescued by the family, Rikki-Tikki-Tavi takes it upon himself to take care of and protect them. This is seen in a number of instances. The first time is out in the garden, when the young boy, Teddy, is threatened by a small snake named Karait. Rikki-Tikki-Tavi immediately takes it upon himself to kill the snake to help Teddy. Later, the cobra Nag sneaks into the family's bathroom, and he waits to bite them. Rikki-Tikki-Tavi kills Nag before anything bad can happen. Finally, Rikki-Tikki-Tavi kills Nagaina, Nag's wife, in order to protect the family.