He traveled on a tight schedule and tested the skills of various powered heroes on each planet in order to determine if there is a suitable 'champion' to defend that planet.

Allen the Alien: Previously a Champion Evaluation Officer who worked for the Coalition of Planets.

Eventually she and Mark realize their true feelings for each other and the pair start dating, fall in love, and eventually get married after Eve gives birth to their daughter Terra. Can manipulate all matter, although a mental block has previously stopped her from creating and manipulating living things. Eve was created as a result of a government experiment to create super-beings.

Atom Eve: Samantha Eve Wilkins, former classmate of Mark's and member of the Teen Team.

Marcus Murphy: Also known as Marky, he is the son of Mark and Anissa after the latter raped the former.

Terra Grayson: The daughter of Atom Eve and Mark Grayson who would go on to become the third Invincible.

He first takes the sobriquet of Kid Omni-Man and then Young Omni-Man as he attempts to rehabilitate the memory of Omni-Man in the general public. His mother tells his brother to take him to Earth, so that he can have a life with the people there, because their lifespan is longer than her people's, and he gets adopted by Debbie. Although his mother is an insect-like humanoid, he resembles a Viltrumite/human with purple skin (later fades to pink). The result of a relationship between Nolan and a member of an alien race who have short life spans, growing at a rapidly increased rate compared to humans, though his father's DNA is slowing his aging over time.

Oliver Grayson: Mark's alien half-brother.

Lord Argall: The former king of the Viltrumites prior to his death and the father of Omni-Man and grandfather of Invincible and Oliver Grayson.

Debbie Grayson: Mark's mother, Nolan's wife, adoptive mother of Oliver Grayson.

Omni-Man: Mark's father Nolan, Debbie's husband and formerly the greatest superhero of Earth.

Mark Grayson: A 17-year-old high school student and a Viltrumite/human hybrid who becomes the superhero Invincible.

The double-sized final issue was released on 14 February 2018.

In August 2016, Robert Kirkman announced that the series would end late in 2017 with issue #144, with Ryan Ottley 'coming back to the book' for the final twelve-issue sequence. The book is notorious for being graphically violent despite its colorful nature and visuals.

Kirkman has provided back-up space for a few aspiring comic creators, most notably Benito Cereno and Nate Bellegarde. Ryan Ottley assumed art duties with issue #8 and drew all other issues. Cory Walker co-created the book and provided art from #1 to #7 as well as #127–132. While Robert Kirkman has been the sole writer of the series, Cory Walker and Ryan Ottley have contributed the art. Ryan Ottley, Robert Kirkman and Cory Walker at Lucca Comics & Games 2018.

Invincible comic books