Every version of Kang in the end credits scene
As seen in Marvel's Ant-Man and the Wasp: Quantum Madness, Kang and his mutants have arrived in the MCU as the next big threat to the multiverse.

Warning! This post contains SPOILERS for Ant-Man and the Wasp: Quantumania
Although Jonathan Majors' Kang the Conqueror made his official debut in Ant-Man and the Wasp: Quantum of Fury, several variations of him from the comics also make an appearance in the MCU's post-credits scene. Originally known as "The Man of Remnant" in Marvel's Loki, the breaking of the sacred timeline brought about all these different versions of Kang, the time-traveling tyrant who destroyed entire universes and Trillions of lives. However, it has been shown that Kang's main antagonist is not a hero like the Avengers.
Numerous versions of Kang (aka Nathaniel Richards) appear in the end credits scene of Ant-Man and the Wasp: Quantum Fever. However, four of them are very similar to the original Marvel Comics variants. In the first scene, the three variants discuss Ant-Man and the Wasp defeating the Kang variants they were exiled to the Quantum Realm. Likewise, the second trait is another important Kang variant set for Loki season 2. Here are the identities of every known variant that appears in Ant-Man and the Wasp: Quantumania (except for the film's main Kang).
Immortus, The Once and Future Kang

In the first credits scene, Immortus is the actual leader of the trio A bearded kang with a big hat and blue skin. Expressing his concern over the exiled Kang's death in the Quantum Realm, Immortus confirms that the heroes of Earth-616 have made contact with the multiverse. Thus, it is revealed that he has summoned all the different Kang variants that exist in the grand multiverse.
In the original comics, the Immortal is the oldest version of Kang, who he will become in his own future. Ruler of the realm known as Limbo, which, like the Quantum Realm, lies outside of time and space, Immortus eventually realizes how much of a threat his younger self poses to the time flow and actively works to stop Kang's plans. He even works with the Avengers at times as an uneasy ally. Likewise, Immortus started working for the Time-Keepers, though the MCU has changed that dynamic, as seen in Loki, where He Who Remains created the Time-Keepers to run the Jet Lag Authority.
Rama-Tut, The Ancient Egyptian Pharaoh

Kahn's variant wearing the clothes of an Egyptian pharaoh is undoubtedly Ramatu. In the original comics, Ramatu was Kang's version of Going Back in Time to conquer Ancient Egypt. He was also the first version of Kang to fight back when the Fantastic Four also traveled back in time. Rama-Tut also meets the young En Sabah Nur, a powerful mutant who becomes the X-Men's main villain Apocalypse and the Egyptian moon god Khonshu. Additionally, some Easter eggs in the MCU helped confirm that this version of Kang the Conqueror was teased in Moon Knight.
Kang Prime Or Scarlet Centurion: Who Is The 3rd Kang Variant In The Mid-Credits?

Although not red, the third Kang who meets the Immortals and Rama-Tut in Ant-Man and the Wasp Fever may be a variant known as the Scarlet Centurion. The tubes on the head and shoulders are also a noteworthy part of the manga version. A New Nickname and Appearance Kang claims after being cast as Rama-Tut by a series of heroes running out of Egypt with Apocalypse and Khonshu, that Scarlet Centurion is inspired by Doctor Doom, who is said to be one of Kang's ancestors. The Scarlet Centurion also has a more futuristic style and weaponry, while also wielding a hypnotic device used to affect enemies.
This third Kang may also be another noteworthy variant, like Kang Prime, more classic Conban who appeared as Scarlet Centurion. Kang Prime is also the first to fall in love with the comic book version of Ravonna Renslayer (whose MCU version may also meet a version of Kang). However, it's unclear if Kang exiled to the Quantum Realm means the MCU's Kang Prime.
Council of Kangs Perfectly Recreated From Marvel Comics

Of the army of variants revealed in the first end credits scene of Ant-Man and the Wasp: Quantum Fever, there are too many versions of Kang to count or identify. At Immortus' call, Kang of all shapes and sizes appeared in a vast amphitheater surrounded by gigantic statues of the conqueror Kang himself. So, it stands to reason that they're all gathered in Immortus' realm of Limbo or Chronopolis, Kang's traditional base of operations in the comics, from where he monitors his timeline-spanning empire and various conquests.
It's also worth noting that the last shot of all the kangs in the stands yelling is a direct recreation of a page from the Marvel Comics. Appearing in 1988's Avengers #292 from Walter Simonson and John Buscema, Kang Prime was introduced to the Council of Kang "The gigantic amphitheater shook to thunderous applause". So when Avengers: Reign of Kang hits theaters in 2025, it looks like the Council of Kang will be the main threat to Earth's Mightiest Heroes. ^Last but not least, one of Ant-Man and the Wasp: Quantum Fever's endings features Kang's funniest variant named Victor Timely. Traveling back to the early 20th century to better conquer the 21st century in the comics, Kang as Victor Timely establishes the town of Timely and becomes its mayor, using his time travel technology to create a vast manufacturing empire based on robotics.
Victor Timely Will Encounter Loki and Agent Mobius

In the MCU, it appears the Victor Timely variant will play a major role in Loki Season 2. In the second post-credits scene, Tom Hiddleston's Loki and Owen Wilson's Agent Mobius make an appearance as Victor reveals his technology to the crowd who also appear to be early 20th century attendees. After Loki's first season ended, the God of Mischief was well aware of Kang's powers and the danger his mutant Sylvie posed when he unleashed them all after breaking the sacred timeline. Now, it looks like it's Loki season 2 will follow Kang from Ant-Man and the Wasp: Quantum Fever.
More: MCU's Quantum Realm Explained