He is Ultimate Marvel's version of Mister Fantastic, initially presented as a heroic, morally altruistic and scientifically driven superhero and a younger, modernized alternate version of Reed Richards, who later turns into the villainous Maker, after enduring a series of tragedies and immense mental trauma; he eventually becomes part of the regular Marvel Universe, serving as an enemy and evil foil to his parallel universe counterpart, the New Avengers, and Eddie Brock/Venom, serving as an example of what his Earth-616 counterpart could have been had he used his powers and intellect for evil and malice.

However, during the "Absolute Carnage" and "King in Black" storylines, the Maker revealed he had been coordinating with the Council of Reeds (a group of other alternate counterparts of Mister Fantastic) and had utilized the many Symbiote Codexes he had extracted from the various heroes and villains who had been previous hosts as a means to repeat his long-standing goal: restoring his native dimension (not knowing that it has already been restored as revealed during the events of Spider-Men II storyline), which he sets out to enact in the 2023 miniseries Ultimate Invasion, resulting in the creation of the new Ultimate Universe after altering the timeline of another universe.

[4] Born in the suburbs of New York City, Reed Richards was a brilliant, intellectually-gifted and knowledgeable, but socially-withdrawn, shy and reserved, scientific child genius, who possessed a high IQ level of 267 and held a deep-rooted love and passion for science, being well-versed in various fields of scientific topics, such as astrophysics, chemistry, biology, quantum mathematics, mechanical and electrical engineering, advanced chemistry and robotics and was the brightest student in school.

However, due to his bookish and introverted personality, he was regularly picked on and tormented by bullies, while also receiving similar treatment from his father, who despised his son for his non-masculine and studious nature.

During the final experimentation phase of his research, Reed was visited by Ben Grimm, his best and only friend since childhood, who protected him from bullies during his years in school.

At the age of 21, Reed, along with other scientists, attempted to teleport organic material through an alternate plane of existence called the N-Zone, with Sue assisting him and Johnny and Ben observing the demonstration.

They have a series of adventures and encounters with a number of super-human and extraterrestrial threats, during the four's attempts to solve the mystery behind the source of their new-found powers and turn Reed and Ben back to normal.

Throughout the series, Ultimate Reed Richards' personality remains largely similar to his Earth-616 counterpart, being a well-meaning, altruistic and unassuming, but socially-awkward, quirky, eccentric and over-analytical polymath in his early-20s, who balances his love and passion for science with his blossoming relationship with Sue, while also serving as the brains and leader of the Fantastic Four, devising the team's equipment and strategy against adversaries, while being notably younger and snarkier than his mainstream counterpart.

After the Ultimatum miniseries resulted in the death of many heroes, Reed attempts to propose to Sue during Franklin Storm's funeral but she breaks up with him and the Fantastic Four is disbanded.

It becomes clear that Reed's worldview has changed to a more sinister outlook, as a result of the mental and emotional trauma endured from the Ultimatum coupled with Sue's rejection and breakup.

He has come back to fight against the Ultimates after spending 1,000 years in the distant future—having been unable to age due to his powers—and the top of his head has been 'stretched' in order to increase his intelligence.

[15] Nick Fury secretly recruits Reed to help draft counter-measures to doomsday scenarios, where he eventually starts having to fight Incursions.

In addition, he talked about how the Venom symbiote has lost its personality, saying it is just a guard dog now, that it can't give Brock powers anymore.

[32][33] After Eddie Brock becomes the new King in Black following Knull's defeat, Venom tells the Avengers that Maker is still around and may be plotting an invasion on the main Marvel Universe.

The Illuminati confront the Maker, but he escapes and starts to rewrite the history of another universe, being shown preventing a spider from biting the Peter Parker of that world.

[39] Other deeds included enabling Loki to take the throne of Asgard by having Thor imprisoned and Odin killed, and witnessing Howard Stark becoming the business partner of Obadiah Stane.

While holding an event in Latveria, Maker emerges from The City and the international gathering is crashed by an army of clone versions of the Ultimates.

He later has a group of innocent people vaporized since they are the genetic ancestors of the clones who were created in the future as he states that he'll need the help of Howard, who operates as Iron Man in this reality.

Taking him into The City, Howard is tasked with building the Immortus Engine (the time machine the Maker used to alter the timeline of Earth-6160) and is paired up with Doom.

Howard's son Tony Stark takes up the name of Iron Lad as he and Doom use the Immortus Engine to retrieve Captain America's frozen body before Maker can find it.

[43] Later, as the Guardians of the Galaxy meet the team, they reveal themselves as coming from the erased 61st Century of the original timeline, nonexistent due to the actions of the Maker (called The Unmaker by members of the group).

It is revealed that his abilities allow him to stretch his brain in order to accommodate and solve almost any problem, thus making him effectively a human computer, so Reed is a genius with an IQ of at least 267 at age 16.

[52] During the "Eternity War" arc, an alternate version of the Maker (sharing the same consciousness as the one imprisoned by the New Avengers) arrives on Counter-Earth to collaborate with High Evolutionary to "evolve the entire multiverse".

[53] The Maker uses the High Evolutionary's machinery to destroy the Superflow that keeps the different universes separate, merging them into one reality to help Eternity fight the First Firmament.

[52] He also uses the machine to revive the Earth-1610 Ultimates (Captain America, Iron Man, Giant-Man, Wasp, and Hulk) in case anyone tries to reverse his universal fusion.