List of antagonists and minor characters

== Antagonists ==
=== Worm ===
Worm is the main antagonist of Season 1. They are the last remaining piece of a hivemind whose planet was destroyed by The Captain. They are wearing the corpse of a human. In Season 1 Episode 3: Quality Slime Together, they have a hard time understanding why Bayani would not sacrifice Mishka, since they consider Bayani and Mishka to be parts of a singular person. During Season 1 Worm forms a bond with the townspeople who attend the arts and crafts club. In Season 1 Episode 5: Exit Strategy Worm saves the townspeople from Mishka. In the process Worm sacrifices the corpse they are wearing, along with some of themself.
=== Jessica, Co, and unnamed character ===
Jessica, Co and an unnamed robot character are the antagonists in Season 1 Episode 5: Exit Strategy. In the episode they kidnap and torture Mishka in order to find out more about Milph's plans. They believe that Milph's actions do not match what The Captain would usually do. Jessica is a big alien in a spacesuit, while Co is a smaller robotic character with the ability to thransform his body. Little is known of the third robotic character, which appears to be a third wheel in Jessica's and Co's relationship.
=== Kiera Knightley (previously xXEarth DestroyerXx) ===
Kiera Knightley appears in Season 1 Episode 2: Number-Two-Head. She is a robot that has the appearance of a suit of armor with a human head. She is MIph's first failed attempt at making the Earth Destroyer. Milph was so proud of making her that he opted for a hands-off approach and sent her to Earth. During her time on Earth she began to want to protect it, instead of destroying it. She appears to have friends on Earth. Milph and Kiera dislike each other after Kiera's change of heart, since Milph considers her a failure. Kiera considers Ed her enemy, while also stating that Ed could never match up to her power. Despite losing to Ed, she still considers herself superior. 
=== Flamingo kid and the "Flamingoes" ===
The Flamingo kid appears for the first time at the beginning of Season 2 Episode 3: The Earth is a Ball. He is obsessed with flamingoes. He finds an alien spaceship crashed in the woods, which has three microbial aliens inside. These aliens loosely resemble the shape of a Flamingo. The Flamingoes grant him powers meant to protect Earth from the Earth Destroyer. In return for protecting Earth Flamingo asks the Flamingo Aliens to make his dad better. During Season 2 Episode 4: First Day, Flamingo suspects that Ed might be the alien he is meant to destroy. Although at the beginning he fights him, Ed does not seem interested in fighting Flamingo back, as he does not percieve him as a threat. During Season 2 Epsisode 5: Talent and Purpose, Flamingo wonders if he should save Ed from being taken by The Caretaker.
=== The Caretaker ===
The Caretaker is a member of Milph's species. The Caretaker has a minor appearance in Season 2 Episode 1: Plan C for Change, where they are briefly shown in a spoking spaceship. This is pressumably the sabotage that Milph aske The Subsitute to perform. The Caretaker is a different gender/sex than Milph, where the gender-role is that of taking care of infants. Going to Earth in case the Earth Destroyer takes the form of a child was their only chance to get off their homeworld. They are meant to be the next project leader during Ed's infancy stage, which Milph opposes. The Caretaker does not believe Milph and Mishka are equipped to deal with Ed and make sure that he grows capable of destroying the Earth.
== Minor characters ==
=== Sofia White ===
Sofia is Mishka's younger sister, who has a strained relationship with him. She appears in Season 1 Episode 2: Alien Hand Syndrome, where she visits Mishka. She is a physics student, and has found work before graduating. She is seen taking some of the blue goo from the alien hand, but pretends to be oblivious to the events in the episode. 
=== The Substitute ===
The Subsitute is a member of Milph's species. They appear in Season 2 Episode 1: Plan C for Change. They enjoy transforming their body and are curous about the Captain's plans for Mishka. Milph and The Substitute are academic rivals.