Some TMNT stuff was always meant for grownups.
- Ambassador Korobon: Appears in volume 4.
- Brother Ildak
- Bydex: An Utrom appearing in in the issue Soul Survivor.
- Emissary Rikby: The Utrom driving the TCRI truck which carried the ooze that mutated the turtles and Splinter. Wishing to see his “children”, whom he felt responsible for, he recruited the turtles to save Leatherhead, who had been kidnapped by The Illuminated. In order to save the mutants, he implanted a bomb into himself, which he used to destroy the Illuminated’s base.
- Dr. Klynor
- Dr. Xeinos: A female Utrom scientist which first appeared in the non-canon (by Mirage Studios standards) Volume 3 of the series. She was left behind on Earth after the Utroms left to their home planet, and found and befriended Leatherhead who nursed him back to health. She also played chess with Splinter. Dr. X later began making appearances in Tales of the TMNT vol. 2, where she is often seeing accompanying Leatherhead. In the short story Threads, he was revealed to be the one who Leatherhead in the sewer when he was still a normal alligator.
- Captain Glonar
- Korobon: Korobon is an Utrom who declared himself ambassador to Earth from the Utrom Confederation. He addressed the U.N. on live television and explained what the Utroms had planned to do on Earth. He appeared in Volume 4 of the comic.
- Glurin: Glurin is a young Utrom scientist who was stationed on their Earth base. When April O'Neil was infected by nanobots placed in her body by Dr. Baxter Stockman, he came up with the idea of using other nanobots to combat them. He designed the new nanobots after the Turtles and called them the nanoturtlebots. He appeared in Volume 4 of the comic.
- Glyminal: Member of a seven-member Utrom group that attempted incorporation of a charge in mutagen stranded in an inaccessible part of the South American jungle and had adapted to their new living conditions there.
- Navigator Thurak
- Sister Grum
- Professor Obligado: Obligado was a brilliant Utrom scientist whose life and death is shown in the back pages of the new Tales of the TMNT vol. 2.
- Dr. Oolric:
- Klag: Klag is an Utrom who helped Michelangelo in Michelangelo: The Third Kind mini-series. During the first contact with the Utroms he helps the prevent the escalation of violence within xenophobic hate groups through fighting them alongside Michelangelo and eventually using Utrom technology to kidnap and impersonate their leader and deliver an anti-hate speech.
- Rogro: Appears in the comic "The Curious Case of Mr. Jones"
- Security Officer Yat: An Utrom from the story Terror by Transmat!.
- Science Advisor Shuthan
- Sergeant Xitor: An Utrom who serves as a police officer on Earth, under the guise of a female human. In her appearances, she unsuccessfully tries to prevent the Utrom Preservi from taking the late Professor Obligado's memories.
- Radical Utroms
- Utrom Preservi: A group of Utroms that specializes in the preservation of memories that are downloaded and archived directly from the brains of dead Utroms.
- Utromi Secreti Obscura:A kind of secret troop of Utroms, which is mainly used for concealment and monitoring tasks, particularly in the area of teleporter technology.
- The Enlightened Ones (The Illuminated): A group of Utrom fanatics that used a clone army (with Leatherhead as their source of DNA) in an attempt to wipe out all violent species in the galaxy).
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