Styles is said to appear in Eternals’ post-credits SCENE.

Harry Styles will join the MCU in a post-credits tag as Eros, nicknamed Starfox, according to reports from Monday’s global premiere. (No, not the one who has a proclivity for barrel rolls.) Eros is a member of the Eternals, an ancient, immortal race of humanity tasked with protecting Earth from the Deviants—and the brother of MCU villain Thanos. Following Christopher Nolan’s Dunkirk, Eternals will be the actor’s second significant acting project, ahead of his appearance in Olivia Wilde’s Don’t Worry Baby, which will be released in 2022.
In the comics, Eros grew up alongside the world-breaker on the planet Titan, where he had a life like to that of the Greek god of love, experiencing naughty adventures full of action and womanizing. Thanos’ reign of terror drives Eros to reconsider his actions, and he joins the Avengers to assist them in defeating him. The Eternal finally made his way to Earth, where he became an Avengers trainee and earned the moniker Starfox. Eros appears on an irregular basis throughout Marvel’s history, usually to assist Thanos.

With a star like Harry Styles, it’s safe to assume that he’ll play a key role in the MCU’s future events, but only if he undergoes a dramatic redesign. In fact, given how intricate of a figure Eros is, I’m surprised the MCU will recognize him at all.
Eros’ most memorable narrative is one that we don’t expect to see in the MCU: he plays a key role in a She-Hulk plot in which he is accused of sexual assault by numerous women on Earth. Eros’ abilities are similar to those of other Eternals in that he possesses superhuman strength and the ability to manipulate others’ emotions. Eros is on trial in the Dan Slott-written arc, with lawyer Jennifer Walters as She-Hulk (played by Orphan Black’s Tatiana Maslany) defending him because the two had a romance during their time as Avengers.
This is not a drill: Harry Styles has joined the Marvel Cinematic Universe as Eros, the brother of Thanos. https://t.co/1woA9Vtlhy
— Vogue Magazine (@voguemagazine) October 19, 2021
Eros didn’t use his powers on Jennifer to impact their relationship, but he did trick her into having a connection with J. Jonah Jameson’s son John. Jen hulks out and begins kicking the crap out of him, but not before Eros is apprehended and sent to Titan for trial. Eros is finally punished for manipulating Thanos’ obsessive love for Death (which was not included in his portrayal in the MCU movies). Eros decides to have his charming abilities disabled by a physic block so that he doesn’t hurt anyone else again.
Eros has spent much of his recent comic book history interacting with Marvel’s cosmic heroes such as the Guardians of the Galaxy and the Nova Corps, so he could appear in Guardians of the Galaxy Vol 3 as well. But even in those plots, he’s more of a background character than a protagonist.
Nonetheless, when Eternals comes out in a few weeks, we’ll have a better notion of the context of his introduction and what it might imply for the MCU’s future.
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