Is i and it a prounoun?

Yes, the Word 'I' (always capitalized) is a personal pronoun, the first person (the one speaking) singular, subjective form. The objective, first person singular form is 'me' (not capitalized).

• I saw the new movie today. Jane and June went with me.

The Word 'it' is also a personal pronoun, the third person (the thing spoken about), singular form, which can be used as a subject or an object in a sentence.

• Jane and I liked the movie, we thought it was funny, but June didn't like it.