There have been many gods that have come and gone throughout Marvel Comics, and one of the most infamous is Loki, the Asgardian God of Mischief. While everyone knows about his half-brother Thor and his relationship to Odin and the Frost Giants, Loki also had a son.
This was Vali Halfling, the illegitimate son of Loki, who was born to a mortal mother. He has similar magical abilities as his father but on a much smaller level. Instead, he spent most of his years fathering children on Earth and then putting together an organization known as the Pantheon. His goal was to try to bend the world to his ideals and designs.
Vali Halfling made his first appearance in the pages of The Incredible Hulk #376 by Peter David, Dale Keown, and Bob McLeod. He made his grand entrance in issue #381 (1991) when he introduced himself to Hulk as Agamemnon, the creator of a think tank known as the Pantheon. This era was when Bruce Banner fought the green and grey Hulk and gained control, creating a Hulk with him in power. In this introduction, Agamemnon explained that the Pantheon observes the world, look for disasters, and tries to stop them, making someone with Hulk's power and Banner's brains an invaluable asset. Hulk joined the group.
Agamemnon, taking on the form of an older man, also admitted upfront that he was the child of a god with a human mother, although he didn't say which god. Agamemnon eventually left the team in Banner's control and disappeared. In Incredible Hulk #421, Hulk found Agamemnon, who had taken the guise of a teenager. It turned out he was using the team for nefarious reasons. The Pantheon was his descendants, and a former member, Jason the Renegade, tried to kill him. This confrontation led to a great battle in Asgard, where they learned Agamemnon was Vali, the son of Loki, and one of the rulers of the Frost Giants.
When Hulk realized Agamemnon planned to destroy everything he built, killing countless people, including his descendants, he had to stop him. Hulk thought Vali's threat ended when a ship he tried to escape on exploded. However, Halfling is the son of a god, and death doesn't come easily -- especially with Hela as a sibling. Vali Halfling returned in the Heroic Age: Prince of Power miniseries by Fred Van Lente, Reilly Brown and others, after Amadeus Cho learned he was the chosen one to replace Hercules. Vali's resurrection came alongside all the gods of Asgard following Ragnarok.
Vail Halfling immediately set his sights on Cho and the Olympus Group. Cho knew all about Vail and the Pantheon, and the two battled. Vail wanted to destroy all gods, and Cho set out to stop him. It was here that Balder the Brave revealed Vail was the illegitimate son of Loki. Loki previously banished him to Earth and cursed him to remain a teenager forever.
Vail Halfling has magical powers, similar to his father, but he couldn't use them without help, and he was no match for Cho in this battle. In the end, Cho banished him to Duat for punishment. Vail returned one last time to face X-Factor as he was one of the mythical beings hunting Wolfsbane's baby. In X-Factor #223-224 by Peter David Emanuela Lupacchino and Guillermo Ortego, he captured Wolfsbane to prepare for an upcoming war. Since her child would be the firstborn of a mutant and a god (Hrimhari, a wolf god of Asgard), Agamemnon believed whoever controlled the child would win the war. What he did not expect was the baby, Tier, to escape his mystical bindings and slaughter him on the spot. With that, the son of Loki died.