There are several possible variants of Kang that could appear in Avengers: The Kang Dynasty towards the end of Phase 6, so speculation is rising about which iteration of the villain will debut in Ant-Man and the Wasp: Quantumania.
Rama-Tut, a variant of Kang, first appeared in Marvel Comics during 1963's Fantastic Four #19, while the original villain debuted a year later in The Avengers #8, though variations on the character have appeared over the years. Majors portrayed He Who Remains in Loki, the man behind the TVA, setting the character up to be the next major MCU villain after Thanos. During an interview with warrior variant of Kang the Conqueror, suggesting that this isn't the same character that audiences have already been introduced to. There are many variants of Kang that could appear in the MCU's future, though the warrior tease for Quantumania certainly narrows down the options for which version viewers will see next.
Kang the Conqueror
Born in the 31st-century, Nathaniel Richards was a descendant of the father of Reed Richards, the founder, and leader of the Fantastic Four. After Victor Von Doom creates time-travel technology, Nathaniel becomes obsessed with having a command over time, finding himself in various timelines before settling in a future dystopian Earth where he reinvents himself as Kang the Conqueror and hatches a plan to expand his dominion over the galaxy and time itself. Kang the Conqueror is shown to be a formidable enemy to the Avengers and the Fantastic Four, despite not harboring any superhuman abilities besides his extraordinary genius, high-tech suit, and his time-ship that allows him to gather technology and weaponry from any century.
In later years, this version of Kang was shown to have been tethered to Doctor Doom in a quantum entanglement. If that sounds familiar, it's because Scott Lang, a.k.a. Ant-Man, became tethered to Janet Van Dyne in a quantum entanglement during The Conqueror variant of Kang is perhaps the most recognizable, so it seems probable that Marvel Studios would want to introduce him to the MCU first, especially considering he already received a mention during He Who Remains' monologue in Loki.
Rama-Tut
Rama-Tut was the first variant of Kang introduced in Marvel Comics, a version of the character who ruled over Ancient Egypt after traveling back from the 31st-century with Doctor Doom's technology. While ruling over the Ancient Egyptians, Rama-Tut plans to claim the mutant En Sabah Nur, who would come to be known as Apocalypse, as the heir to his throne, and also has a conflicted relationship with the Egyptian moon god, Khonshu. While it's unlikely that this variant is the one who will appear during Ant-Man and the Wasp: Quantumania, there's certainly some scope for his MCU debut, since he shares a strong connection with already-established characters from Moon Knight.
Since Rama-Tut's rule over Ancient Egypt was relatively short, and he eventually moved on to become Kang the Conqueror, it's probable that this variation on the character won't be appearing in Quantumania. However, since Kang the Conqueror is a future version of Rama-Tut, Quantumania could provide some backstory for the supervillain, perhaps giving audiences a glimpse of his time as Rama-Tut through flashbacks or another monologue, which the character has been shown to have a tendency for. One of the biggest critiques regarding Avengers: Infinity War, so if Marvel Studios decide to flesh out Kang the Conqueror a bit further, mentioning Rama-Tut would be a good first move.
Immortus
In some way, this particular variant of Kang has already been seen in the MCU, since Immortus was the inspiration for the character of He Who Remains in Loki. After growing weary of years of battle, Kang was approached by the Time Keepers and asked to become their agent, preserving timelines instead of conquering them and being gifted immortality in exchange. In this variation, Kang rules over the other-dimensional realm of Limbo, perhaps reminiscent of the Citadel at the End of Time where He Who Remains resided. Immortus is known to be Kang's destiny before the Time Keepers eventually separate the two entities, allowing both to live apart from the other.
Immortus is an incredibly powerful variant of Kang, so if this is the version that appears during Ant-Man and the Wasp: Quantumania, the size-changing team will certainly have a lot on their plate. However, it seems more likely that Immortus' story has already been revealed in the MCU through the guise of He Who Remains, who follows much the same story as his comic counterpart, though he is the man behind the curtain rather than the Time Keepers. Even so, thanks to Kang the Conqueror's time travel abilities, it's certainly possible that Immortus could show his face once again in the MCU.
Iron Lad
This younger version of Nathaniel Richards was saved by his future time-traveling self from an attack that would have hospitalized him for years and shaped him into a villain. Hoping to inspire the young Nate, Kang takes his younger self through time to witness his many battles and victories, though this only works to convince Nate that he should avoid this future. Nate steals Kang's armor and time-travel technology, enabling him to return to his own time and become the hero, Iron Lad, who would go on to form the Young Avengers. It's fairly obvious from the Ant-Man and the Wasp: Quantumania trailer that this isn't the version of Kang that the heroes will go up against, but this doesn't rule him out from appearing in the film.
There has been speculation that a Young Avengers team will be set up in the MCU before the end of the Multiverse Saga, since heroes such as Kate Bishop, Billy and Tommy Maximoff, Skaar, and America Chavez have been introduced during Phase 4. If Iron Lad is to debut during Ant-Man and the Wasp: Quantumania, this could be one large step closer to a Young Avengers team-up. On top of this, Iron Lad in Marvel Comics eventually begins a romantic relationship with Cassie Lang, who will appear as Stature for the first time during Quantumania, so it would make sense for Iron Lad to appear as a variant of Kang the Conqueror in the adventure.
Scarlet Centurion
While Nathaniel Richards always seems to take a huge amount of inspiration from Doctor Doom, particularly with the acquisition of his time-travel technology, this variant goes the extra mile and bases his armor on the Latverian villain. The Scarlet Centurion was a powerful villain who wanted to use the Avengers as his pawns to conquer reality, originally turning the Avengers against every other enhanced individual on the planet before pitting them against themselves from another universe. This Ant-Man.
While the Scarlet Centurion had pitted two teams of Avengers against each other, it was Henry "Hank" Pym as the hero Goliath who used his size-changing abilities to shrink and manipulate the villain's time machine. This forced the Scarlet Centurion back into the time stream where he could no longer influence them. There are signs suggesting that this won't be the variant appearing in Ant-Man and the Wasp: Quantumania, specifically the red coloring of the Scarlet Centurion's armor compared to the purple and green of Kang's in the trailer, but the fact that an alternate version of Hank Pym has fought the Scarlet Centurion and won perhaps suggests that Kang could be easier to take on for the ant-sized heroes.
There are several other variants of Kang the Conqueror featured in Marvel Comics, though it's unlikely that the likes of Victor Timely, the Mayor of a small 1901 town, or Mister Gryphon, CEO of Qeng Enterprises, would be described as a warrior by Majors or Sawyer. The most likely variation of Kang to appear in Quantumania is that of the future Conqueror. This character bears the most resemblance to the comic counterpart and is perhaps the most powerful and memorable version to battle the Avengers. After his appearance in Ant-Man and the Wasp: Quantumania, Kang the Conqueror is set to develop even further, with his story snow-balling until what is set to be a monumental battle during The Kang Dynasty at the end of the MCU's Multiverse Saga.
