Scientists on Earth calling themselves the Enclave created an artificial, perfect human, who initially calls himself "Him". After rebelling against his creators, Him decides to leave Earth and travels into space.

Adam Warlock is in possession of the Soul Gem, one of the Infinity Gems. Adam Warlock is significant in the Infinity War where he becomes the almost supreme being by wielding the Infinity Gauntlet.

Wiki - Adam Warlock

Cosmo was a former test animal of the Soviet space program. He was launched into Earth's orbit as part of an experiment but he drifted off into space.

At some point he gets mutated by cosmic rays and ends up at Knowhere, the city built inside a Celestials head. He came to serve as the station's security chief where he meets a distraught Nova.

Wiki - Cosmo_the_Spacedog

Cosmo in Guardians of the Galaxy

His father was scientist who created an energy source called "zero fluid", his mother an alien humanoid woman. After being exposed to a vat of zero fluid, Jack underwent a mutagenic change and gained the ability to project concussive energy from his body. After gaining these powers, Jack began his mission of vengeance against the Corporation that killed his father.

Jack Of Hearts has been a member of the Avengers and Defenders.

Wiki - Jack of Hearts

Gamora is the last of her species, the Zen-Whoberis, who were exterminated by the Badoon (in her original timeline, her species was exterminated by the Universal Church of Truth). Thanos found her as a child and decided to use her as a weapon. Gamora was raised and trained by Thanos to assassinate the Magus, an evil alternate version of Adam Warlock. 

Gamora was part of the Infinity Watch, a team led by Adam Warlock to look after the Infinity Gems.  Most famously Gamora is a team member of the Guardian of the Galaxy.

Wiki - Gamora

Within the Black Galaxy, one mass developed differently from the others. Evolving over millions of years, it grew to the size of a planet and developed intelligence and consciousness along with the ability to move its planet-sized mass by its own will. This planet became known as "Ego, the Living Planet".

Marvel Wiki - Ego

General Robert L. Maverick is the second Red Hulk, Thunderbolt Ross being the first.  He joins the U.S.Avengers where it's revealed that he is the new version of Red Hulk upon being provided with an improved version of the Hulk Plug-In. Unlike Thunderbolt Ross's Red Hulk form, Maverick maintains his moustache and wears sunglasses.

Wiki - Red Hulk

The first such creature was seen in the 19th Century when the creature attacked the sailing ship known as the Pequod. It's captain Ulysses Bloodstone battled the creature. The resulting clash was fictionalized into the literary classic, Moby Dick.

Another Giganto was was used by the Atlanteans as the biological equivalent of a doomsday weapon. It normally stayed in hibernation in a cave somewhere on the ocean floor until awakened when summoned by the Horn of Proteus. Once summoned, Giganto could be directed to attack and destroy any region.

Marvel Wiki - Giganto_(Atlantean_Beast)

In need of cash to pay his rent Spider-Man took money from some advertising executives to advertise their new car.  It turned out he had to build it himself, which he did with help from the Human Torch. The car was fitted with numerous gadgets such as webbing cannons, ejector seats and gas bombs.



Marvel Wiki - Spider-Mobile

Eternity is a Nigh-Omniscience cosmic being.

Before Eternity, there was a single universe, he primal cosmic being that would later call itself The First Firmament.  Eternity is a tremendously powerful abstract entity and the embodiment of the multiverse that has no real physical body.


Wiki - Eternity

Abstract cosmic entities. Lord chaos embodies disarray and confusion whereas Master Order embodies order and balance in the universe.


Wiki - Lord Chaos