[2] The character has been a member of the Young Allies, the Fifty State Initiative, and the Great Lakes Avengers at various points in his history.

[4] They described the character as a modern take on the classic superhero struggles, inspired by McKeever's own Midwestern background and the balance of action and everyday life found in the 1980s Amazing Spider-Man.

Gravity's journey as a rookie hero, learning from mistakes and trying to navigate both crime-fighting and personal challenges, was central to his story, with Norton emphasizing his inexperience despite great power.

After Gravity's death in the Beyond miniseries, McKeever was tapped to write a Captain Marvel series starring Willis as the titular hero, resurrected during the events of Civil War.

[7] His first appearance was in his own limited series: Gravity #1-5 (2005), later released as a digest-formatted graphic novel as part of the Marvel Next imprint aimed at younger readers.

During the summer after his high school graduation, while on board his family's yacht, Greg is sucked into a mysterious black hole and gains the ability to manipulate gravity.

But after he saves the life of a frail old woman, and meets new friends Lauren Singh and Frog, Gravity slowly becomes more confident in his double identity.

[12] After defeating a villain called Brushfire, Gravity stumbles upon a mysterious structure in Central Park and is transported to an alien world where he meets Spider-Man, Hank Pym, Wasp, Venom, Kraven, Firebird, and The Hood.

A mysterious voice claiming to be the Beyonder explains to the gathered heroes and villains that they must slay their enemies to win their reward.

He then deceives the Beyonder into revealing his true identity as the Stranger, and restores the rest of the group, who have been shrunk down using Pym Particles.

[13] When Gravity's grave is desecrated and his body is stolen, Michael Collins enlists the help of the new Fantastic Four (now consisting of Black Panther and Storm as well as the Human Torch and the Thing) to find his fallen comrade.

Following a cosmic residue left behind at the graveyard, the team ventures into deep space to discover that Epoch has stolen Gravity's corpse and resurrected him to serve as the new Protector of the Universe.

To protect Epoch from being consumed, Gravity empties his new cosmic-level powers into Galactus and returns to Earth to see his parents and Lauren once more.

[14] Later, when the Fantastic Four are fighting alongside Doctor Strange and the Silver Surfer to save Eternity from death, Uatu seeks out Gravity's help to act as a "scalpel" to cut out the infected portions of the universe, fulfilling his cosmic destiny.

Gravity and the Heavy Hitters aid the rest of the Initiative to battle and defeat Skrulls posing as the Revolutionary, Equinox, Thor Girl, and Great Lakes Avengers member Grasshopper.

[17] After the Skrulls' secret invasion, when Norman Osborn gains control of the Initiative, Gravity is replaced as the leader of the Heavy Hitters with Prodigy.

[19] With the fall of Osborn's Initiative, and the abolishment of the Superhuman Registration Act, Gravity quits the Great Lakes Avengers and considers giving up his position as a hero.

The return of Warhead and the Bastards of Evil, an anarchist group claiming to be the estranged children of supervillains, brings Gravity together with fellow hero and university student Firestar.

Later, Gravity and Firestar team up with Nomad, Spider-Girl, and Toro to defeat Superior, the son of the Leader, the creator of the Bastards of Evil.

When Hardball causes an explosion during a battle with Juggernaut, who was transformed into Kuurth: Breaker of Stone, in Las Vegas, Nevada, Gravity confronts him, blaming him for his carelessness.

[30] Gary Walker of Comic Book Resources praised Greg Willis as a relatable and empathetic character, noting his early struggles and internal conflicts that made him endearing to readers.