Breakdown

A psychopathic alien with an affinity for genocide, he spent a large portion of his time in Equestria causing trouble for the locals. Upon stumbling across the JLE he took an particular liking to teasing Goldfin and eventually became one of the main contributers to the JLE's problems.

Goldfin
Her constant bragging and false self-confidence drew Breakdown to her like a moth to a flame. He dedicated a large chunk of his life to making her miserable until she one day got fed up and trapped him at the bottom of the ocean. After making his escape he sought to take vengence on her only for it to cost him his best friend, Cicero.

Cicero
A whale whose life he saved (with help from Goldfin), Cicero quickly became Breakdown's best (and only) friend. The two spent large chunks of time together and even risked their lives for each other. His life ended when a crash caused by an EMP caused Cicero to sustain fatal damage. The two blame themselves for the this tragic event.

Mane-iac
Breakdown took a great interest in the mad mare. Her insanity and craving for chaos causing him to see her as both a great potential ally and even friend until one day she harmed Cicero. After this Breakdown swore vengence but due to unfortunate circumstances never achieved it.