Marvel Studios showed fans just enough to start asking questions.

At San Diego Comic-Con 2026, the studio displayed a mysterious masked costume from Avengers: Doomsday under the name “Latverian Witch.” Over the course of the convention, the display was seen in three different color schemes: green, orange and purple. Marvel’s own SDCC coverage acknowledged the Latverian Witch costume, but offered no identity for the person who might be wearing it.

That silence matters.

Marvel could have displayed another recognizable hero costume. Instead, it introduced a name audiences have never encountered in the MCU, covered the character’s face and then changed the color of the outfit.

With Avengers: Doomsday officially scheduled for December 18, 2026, the costumes have become another puzzle surrounding Doctor Doom and the enormous collection of Marvel characters expected to collide around him.

One important distinction should come first: Marvel has not announced four Latverian Witches. The three SDCC looks reported publicly were green, orange and purple. A fourth black figure appearing in fan graphics and online speculation should therefore be treated separately — as an extension of the theory, not as another officially revealed SDCC witch.

With that in mind, here are four identities that could explain the colors — from the surprisingly plausible to the deliberately wild.

Purple: Agatha Harkness

If Marvel wanted fans to associate one of these costumes with an established MCU witch, purple would be an extremely effective way to do it.

Kathryn Hahn’s Agatha Harkness has been visually tied to purple since WandaVision. The association continued into Agatha All Along, where her wardrobe retained purple detailing and her magical identity remained inseparable from the color. Marvel’s own costume coverage specifically highlighted purple elements in Agatha’s signature look.

That makes the purple Latverian Witch an easy target for speculation.

Agatha also sits directly inside the supernatural corner of the MCU. She understands ancient magic, has spent centuries dealing with other witches and has crossed paths with powers far beyond conventional Avengers territory.

There is another complication, however. Agatha All Along did not leave its title character in an ordinary position from which she could simply walk into the next Avengers film. The finale dramatically changed Agatha’s circumstances after her confrontation with Rio and Billy Maximoff.

In a franchise now built around magic, alternate realities and unconventional forms of existence, that does not make a return impossible. But it does mean the purple color alone is nowhere near confirmation.

Marvel has not announced Kathryn Hahn as the person beneath a Latverian Witch mask.

For now, Agatha remains an appealing visual match — and nothing more.

Green: Rio Vidal, a.k.a. Death

The green costume may have an even cleaner color connection.

When Agatha All Along introduced Aubrey Plaza’s Rio Vidal, the series deliberately presented her as a Green Witch. Costume designer Daniel Selon explained that Rio’s design drew on her connection to nature, with textures intended to evoke elements such as bark and leaves.

Then the series revealed the larger truth: Rio was not simply another witch. She was Death.

Marvel’s own discussion of the finale identifies Plaza’s Rio as the literal embodiment of Death, giving her a supernatural status far beyond an ordinary member of Agatha’s coven.

That makes the green Latverian costume particularly tempting.

Doctor Doom surrounding himself with powerful magical figures would already fit his comic-book history. Doom interacting with Death herself would push the idea much further.

But the same warning applies here.

There is currently no official confirmation that Aubrey Plaza appears in Avengers: Doomsday, and Marvel has not connected Rio Vidal to the Latverian Witch display.

The green color gives the theory an elegant visual logic. It does not give it evidence of casting.

Orange: The Ancient One

The orange theory is where things become much stranger.

Tilda Swinton’s Ancient One was one of the foundational figures of the MCU’s mystical world, introducing Stephen Strange to sorcery, the Masters of the Mystic Arts and forces operating beyond conventional reality.

There is also an obvious problem with identifying her as the orange witch: the Ancient One died in Doctor Strange.

Marvel’s own Doctor Strange character history describes her death after Kaecilius’ betrayal, leaving Strange to continue down the path she had helped open for him.

Yet death has not completely prevented the Ancient One from appearing again. Avengers: Endgame revisited her during the Avengers’ journey into the events of 2012, with Swinton returning to the role.

For Doomsday to bring her into the present story, Marvel would therefore need another mechanism — perhaps a variant, an alternate universe, time manipulation or some other supernatural intervention.

That is exactly why the idea works so well as the wild-card theory.

Unlike Agatha and Rio, there is no especially strong character-specific reason to look at orange and immediately see the Ancient One. The case depends less on color and more on what Doomsday appears capable of doing with Marvel history.

If realities are colliding, someone who died years ago may suddenly become available again.

Still, there is no indication from Marvel that Swinton is under this mask.

Black: Doctor Strange — and the Mysterious “Boris” Idea

Then there is the black figure.

Unlike the green, orange and purple costumes, this should not be described as one of Marvel’s three SDCC Latverian Witch reveals. The black image belongs to a newer layer of fan speculation, where the masked figure has sometimes been associated with the name “Boris” and, more provocatively, Doctor Strange.

There is a real Boris in Marvel Comics. Boris is an old associate of Victor von Doom’s family and one of the characters historically connected to Doom and Latveria.

But Marvel has not established that Doctor Strange is secretly playing Boris in Doomsday. Any claim that the black figure definitively represents Benedict Cumberbatch’s character goes far beyond what has been officially revealed.

What makes the theory interesting is the relationship between Strange and Doom.

Doctor Doom has never been merely a technological villain in the comics. Sorcery is fundamental to the character, and Marvel recently pushed that element further by having Victor take the mantle of Sorcerer Supreme from Doctor Strange during Blood Hunt. Doom then used that magical authority during the One World Under Doom storyline before eventually losing the position.

There is even precedent for Strange working at Doom’s side under extraordinary circumstances. During 2015’s Secret Wars, Stephen became “Sheriff Strange,” serving as a key figure in God Emperor Doom’s Battleworld while retaining motivations of his own.

That does not mean Doomsday will adapt the same storyline.

It does mean that a masked Doctor Strange operating inside Doom’s magical circle would not be an idea invented completely from nowhere.

The Masks May Be More Important Than the Colors

Agatha fits purple. Rio fits green. The Ancient One provides the biggest resurrection-or-variant possibility. Doctor Strange has perhaps the most fascinating comic-book connection to Doom.

But Marvel has confirmed none of those identities.

The most intriguing fact remains the simplest one: Marvel deliberately showed audiences a masked Latverian Witch costume while withholding the character beneath it.

And rather than clearing up the mystery, the green, orange and purple variations made the question larger.

Maybe the colors identify familiar characters. Maybe they represent different members of Doom’s magical circle. Maybe they are simply costume variations designed to make fans look for meaning where Marvel has not yet provided any.

The black “Boris” figure pushes the speculation one step further, but it should remain exactly there — outside the three SDCC color reveals until Marvel says otherwise.

If the masks really are hiding people audiences have already met, Avengers: Doomsday may be using Doctor Doom’s arrival to reconnect several corners of the MCU that once seemed completely separate.

And in a story centered on a villain who has mastered both science and sorcery, that possibility may be more important than any single color.