There may be 2 things here that are unclear to you? "kind of" can mean almost, more or less, like (as in similar to) or a sub-set of ("a collie is a kind of dog") "fascinating" means really interesting, engrossing... So, "kind of fascinating" indicates something that you are really interested in but you don't want to go all out and say, "That's fascinating!" In a way, it's an oxymoron ("a figure of speech that combines normally contradictory terms." - wikipedia defn).

Mean that a person like this thing or person