That mysterious man is " Persona " :) Naru used to love Mikan's mother (who also had the same alice as
Mikan) when he was a student in the Academy. Well, I have only seen the anime and part of the comics so I really
can't figure out.. But maybe they might be Mikan's parents, perhaps... who knows?o_o;; In the anime when Mikan
friendly called him "Dad", Naru smiled somehow.. Oh well, that really is a mystery... *lol* Hope this reply
helped you a little...^_^
Personally I think Naru and Mikan's mother look nice together :D [Like in the picture above!]