If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?

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If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?

What is the difference between North Indian people (Delhi, Punjab etc.) and South Indian people (Karnataka, Tamil Nadu, Kerala etc)? - Quora

Is there a difference in skin tone among North Indians, South Indians, and East Indians? If so, which group is considered to have a fairer complexion? - Quora

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