Who is the rarest neighbor in Animal Crossing

There is no rare neighbour as people swap every so often and there are 101 neighbours to be seen.
i think the octopusses are the rarest tipe

No, the octopi are NOT the rarest neighbor. Again, this can vary from game to game. The overall LEAST common neighbors are the alligators and the MOST common is the rabbit, Genji. Hope that helps. :)