I think こっち is okay as one of informal ways of introducing someone. 例: こっちは田中君です。 これsounds like they are treating a person as a thing unlike “this” in English. Or, off the top of my head, for example, when you are talking with a friend while looking at people in some photos, and then you can ask like これは誰？ and then your friend answers あ、これは田中。 And again you ask about another person, でこれは？ The friend says これは吉田だね。 This kind of talk is possible.

i think これは not use for people, for introducing someone using こちらは.

My opinion=> Yes you can. But if it is for the first time, you would want to be a little polite and formal. So, in that case I think using こちらは is better. However, I am still a Japanese learner myself so I hope you will get proper answers from other native speakers. がんばってね！