I don't have a degree in cinema, but it would certainly be first person since Mohinder is present in the story and he doesn't seem to know much about what's going on in other people's lives (which would make him all knowing).
But at the end of the day, his narration is rather light. He talks in poetics and then goes away, so it's kind of hard to classify. Pretty much all different types of narration could fit under the narrations he gives.
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