"Hissssssss.......... Leach is slow on land, but fast in water! Just make sure he doesn't stay in the sunlight for long!"
Leach (or Leech) is a Parasite available in Parasite Too!.
Leach can swim in water without dying. He is slow on land though. But sadly, unlike the others, Leach cannot stay in the sun for longer than a minute before he dies.