Are there any creatures that are good?

Most Cryptids such as Bigfoot, Yeti, Nessie, etc. are neither good nor bad. If they exist they are no moralistic than gorillas, fish, or bears. However there are certain entities in folklore that are "good" in-so-far-as not evil. Such examples would be Mermaids from Celtic Lore, Satyrs from Greek Mythology, and Elves from Norse Mythology.