Ikki the porcupine was an animal who lived in the jungle.
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Early editions of the story name him as Sahi. Kipling may have changed the name because he felt that the porcupine needed a more "prickly-sounding" name.
Ikki also appears in "The Porcupine and the Poison People", a story in Pamela Jekel's Kipling pastiche The Third Jungle Book. In the story, Mowgli and Ikki spend some time playing tricks on each other until Mowgli falls into a nest of hostile cobras and Ikki has to bring help.