Jel

The Jel is a basic type of Slime, with relatively low stats. They are generally not very threatening, but they do spawn in groups of up to five, and they come in Elemental varieties.

Unique Jels
Two completely unique Jels have been spotted in the past - Jelloween and Jingle Jel. They mirrored the Jelearth and Jelice, respectively, but they had unique powers as well, as they were created before Jels were formalized.

Elemental Varieties
As mentioned, Jels come in various elemental forms, each with a new name. They are as follows:
 * Jelflame - Flame
 * Jelearth - Earth
 * Jelwind - Wind
 * Jelightning - Lightning
 * Jelice - Water
 * Jelsol - Solar
 * Jelune - Lunar
 * Jelempest - Storm
 * Jeless - Void
 * Jelour - Time

Drops
Jels are the primary source of Jeldrops, which are used as the world's primary adhesive. Considering Jel's fast reproductive rates, there is no worry about overhunting for this resource. Elemental Jels are also an easy source of Elemental Essences, albeit these drop much less often than Jeldrops - roughly a 1-in-50 chance compared to Jeldrop's 1-in-5. Given how common Jels are, however, it's not exactly strange to see them drop an Essence when killed.