Slymy

Slymy (スライ, Surai) is a slime-type animal. Shortly after the protagonist's arrival to Moon World, he witnesses Hero frying Slymy with a lightning spell. This encounter becomes a tutorial for the player, when Dolottle calls out to the protagonist and implores him to save the souls of the animals slain by Hero.

In Fake Moon, Slymy is represented by a more viscous, blue slime creature with a ghastly face. The hero fights this monster in a random encounter, where he defeats it with a magic spell.

Characteristics
Slymy takes on the simple appearance of a teal-blue, droplet shaped creature. It has round eyes, with black pupils and white lips.

Hint
Dolottle will speak to the protagonist and give him the Animal File shortly after the unfortunate death of Slymy. Slymy seems to enjoy jiggle-hopping around this area.

Trivia

 * Slymy is a direct reference to Dragon Quest's own Slime monster. This is apparent in not only it's blueish, droplet appearance, but also by the fact that it is the first "monster" Hero slays and subsequently, the first animal the protagonist rescues. Slimes are traditionally a beginning monster, as they are very common and the weakest in the Dragon Quest games.
 * On the original official website for Moon made in 1998, Slymy's flavor text was the following: "まず最初にこのモンスターありきとさえ言われる、アレによく似た軟体動物. 他聞にもれず、MOONでも一番最初に勇者に倒される. ", which roughly translates to, "Firstly, it's said that this mollusk greatly resembles a monster. Without saying more, even in MOON, it's the first to be slain by the hero."