Wavio

Wavio (にょろり, Nyorori) is an animal whose body is situated at the entranceway of Mushroom Forest, just to the left as the protagonist enters.

Characteristics
Wavio has a pink, short body with a pointed head. It has a pair of black eyes as it's only facial features. On either side of it's body appears to be white appendages with indents that look like fins or wings.

Translation Differences
In the Japanese text, the line "ミジンコの仲間" or "mijinko no nakama", was translated literally as "friend of water fleas". In the case of animals, "nakama" is used to describe a member of the same taxonomy, which means that Wavio was meant to be a type of water flea.

Hint
Wavio, as its file suggests, likes to see the morning light.

Trivia

 * On the original official website for Moon made in 1998, Wavio’s flavor text was the following: "澄んだ水のあるところに出現する. おいしい水マニア. ", which translates to, "Appears where there is clear water. It's a fanatic for tasty water."
 * From this text and Wavio's Animal File, it can be assumed it's meant to be based on a water flea, or Daphnia. Daphnia are a planktonic crustacean, known to make waters clean as they filter feed on algae, bacteria and protists. Wavio's appearance vaguely resembles a Daphnia from a ventral view; its wings are akin to a Daphnia's pair of second antennae, which are used for swimming.
 * Wavio's Japanese name, "Nyorori", is a word and an onomatopoeia used to describe something either "slithery" or "slimy".