These people are the descendants of humans brought here by Gems thousands of years ago. They've never seen the Earth before.
The Zoomans are the descendants of various ethnic groups of humans from Earth. Many of them display gender-neutral features. All Zoomans wear the standard attire of a blue vest, a long white loincloth held by a brown belt around the waist, and purple earrings used for communicating their daily routine. New members (such as Greg) wear flowers in their hair. As of "Rose Buds", they no longer wear the purple earrings.
Before Era 3, the Zoomans' needs were taken care of as they go through their daily routine each day. They live in happiness, not having a worry in the world due to their ignorance. As of "Rose Buds", this culture has been abandoned, as they now control the ship.
Each of the Zoomans have earrings that contain an automated voice that guides them throughout the day. Different times are scheduled for different events, such as eating, playing (rolling on the ground, reaching for outer space), smelling flowers, swimming, and going to bed.
Occasionally, a special event is held inside of the Zoo titled "The Choosening". Only adult Zoomans take part in the event. Each of the Zoomans stands in a circle with a bright blue fire burning in the middle, and the voice selects two Zoomans. The chosen Zoomans then enter a relationship and reproduce in order to have a constant number of humans living in the Zoo.
Whenever the utopian society is tarnished and chaos breaks loose among the Zoomans, the Amethyst Guards have to enter the containment area in order to calm down the Zoomans. The Amethysts act as therapists, listening to the Zoomans' issues and giving them advice. However, this has only happened twice: the first time being long ago and the second at the end of "The Zoo".
According to Holly Blue Agate, Pink Diamond's Zoo has a human disposal chute set up, which shoots the dead bodies of humans out into space. It is unknown what the Zoomans think of death or if they are even aware of death.
Each of the Zoomans have a happy-go-lucky attitude, finding joy in every aspect of their caged lives. They are very enthusiastic about participating in the daily routine that the voice sets up for them.
The Zoomans are very ignorant. While they are aware of the walls at the borders of their dwelling, they do not seem to realize that they exist in captivity. Being happy is the only emotion that they understand, and they did not possess the knowledge to understand what "hurt" or "bad" meant until Greg inadvertently hurt all of their feelings at once during a Choosening ceremony. Before Greg and Steven entered the Zoo, the Zoomans had no experience with self-determination, resulting in their despair when Greg "choosened" none of them.
As a continuation of this incident, it is shown upon their reunion that many (if not all) Zoomans display animosity toward Greg, refusing to let him enter the zoo, even as a visitor.
Wy-Six (also spelled Y-6) is one of the humans living in Pink Diamond's Zoo. He has fairly dark skin and long poofy black hair. He and Jay-Ten seem to be close friends and are the two Zoomans closest to Greg. Wy-six seems to become a leader of Zoomans and so the all the Zoo.
Because of the Zoomans being sheltered from aspects of society, he does not know of many common objects or emotions mentioned by Greg or Steven. He is confused at Steven's description of a door as an "opening wall," but hears Jay-Ten tell a story of a Gem helping a hurt Zooman after entering through an "opening wall." After Steven describes being "hurt" as feeling bad, Jay-Ten asks what "bad" is.
Later, after Greg explains that on Earth, people are "choosened" by their own free will, Wy-Six is the first to attempt "choosening" Greg. He instantly has an emotional reaction to being "rejected" by Greg, breaking down crying and apparently understanding the feeling of "hurt." After being heartbroken by Greg's rejection, he was seen being carried by an Amethyst guard while crying.
Sometime later, the Zoomans, along with the Quartz guards, took control over the Zoo and piloted the space station to Earth to visit Steven. Wy-Six is one of the Zoomans who greeted Steven when they arrived on Earth. While friendly towards Steven, he still feels strong resentment towards Greg for rejecting them during the "choosening". He then brought Steven and Amethyst onboard the Zoo to hang out and even showed him the Rose Quartz Bubble Room, where he revealed all the Rose Quartz had been unbubbled.
He is voiced by Lamar Abrams.
Jay-Ten (also spelled J-10) is one of the humans living in Pink Diamond's Zoo. She has tan skin and long blonde hair. She and Wy-Six seem to be close friends and are the two Zoomans closest to Greg.
Because of the Zoomans being sheltered from aspects of society, she does not know of many common objects or emotions mentioned by Greg or Steven. She is confused at Greg's mentioning of a "door," only to remember and tell a story of a Gem helping a hurt Zooman after entering through an "opening wall." However, she does not know the meaning of "hurt."
Originally, she was "choosened" by the voice to be with Greg, but he declined. After he explains that on Earth, people are "choosened" by their own free will, Jay-Ten soon follows after Wy-Six by attempting to "choosen" Greg. After being heartbroken by Greg's rejection, she was seen being carried by an Amethyst guard while crying.
Sometime later, the Zoomans, along with the Quartz guards, took control over the Zoo and piloted the space station to Earth to visit Steven. Jay-Ten is one of the Zoomans who greeted Steven when they arrived on Earth. While friendly towards Steven, she still feels strong resentment towards Greg for rejecting them during the "choosening". She then brought Steven and Amethyst onboard the Zoo to hang out with them.
She is voiced by Cristina Vee.
U-12 is one of the humans living in Pink Diamond's Zoo. She has dark skin and black afro hair. During the matchmaking process of the "Choosening," U-12 was "choosened" by the "little voice" to be with F-3.
After being heartbroken by Greg's rejection, she is seen being carried by an Amethyst guard while crying.
F-3 is one of the humans living in Pink Diamond's Zoo. He has light skin and long blonde hair covering his eyes. During the matchmaking process of the "Choosening," F-3 was "choosened" by the "little voice" to be with U-12.
|1. "Kindergarten Kid":||Absent||14. "The Zoo":||Appears|
|2. "Know Your Fusion":||Absent||15. "That Will Be All":||Absent|
|3. "Buddy's Book":||Absent||16. "The New Crystal Gems":||Absent|
|4. "Mindful Education":||Absent||17. "Storm in the Room":||Absent|
|5. "Future Boy Zoltron":||Absent||18. "Rocknaldo":||Absent|
|6. "Last One Out of Beach City":||Absent||19. "Tiger Philanthropist":||Absent|
|7. "Onion Gang":||Absent||20. "Room for Ruby":||Absent|
|8/9. "Gem Harvest":||Absent||21. "Lion 4: Alternate Ending":||Absent|
|10. "Three Gems and a Baby":||Absent||22. "Doug Out":||Absent|
|11. "Steven's Dream":||Absent||23. "The Good Lars":||Absent|
|12. "Adventures in Light Distortion":||Absent||24. "Are You My Dad?":||Absent|
|13. "Gem Heist":||Debut||25. "I Am My Mom":||Absent|
|1. "Little Homeschool":||Absent||11. "In Dreams":||Absent|
|2. "Guidance":||Absent||12. "Bismuth Casual":||Absent|
|3. "Rose Buds":||Appears||13. "Together Forever":||Absent|
|4. "Volleyball":||Absent||14. "Growing Pains":||Absent|
|5. "Bluebird":||Absent||15. "Mr. Universe":||Absent|
|6. "A Very Special Episode":||Absent||16. "Fragments":||Absent|
|7. "Snow Day":||Absent||17. "Homeworld Bound":||Absent|
|8. "Why So Blue?":||Absent||18. "Everything's Fine":||Absent|
|9. "Little Graduation":||Absent||19. "I Am My Monster":||Absent|
|10. "Prickly Pair":||Absent||20. "The Future":||Absent|
- Jay-Ten's name is a play on the name "Jayden".
- Going off this logic, Wy-Six could possibly be a play on the name "Isaac".