Harry Styles as Starfox
Well, your eyes don’t deceive you, because that is indeed the international pop star sensation Harry Styles as Eros or Titan, perhaps better known as Starfox. And yes, Handsome Harry’s Starfox is indeed canonically known as Thanos’ brother. And yes, he is also an Eternal, which also makes Thanos an Eternal.
But wait, if this movie’s Eternals are all synthetic creatures who apparently can’t reproduce, how can Thanos have a brother? Well, some of that is (theoretically) explained in the comics.
Admittedly, the MCU’s Eternals are quite different from the comics versions, but essentially in the comics most of the Eternals were prevented from reproducing the Celestials. And as we’ve seen in the movie, some Eternals will regard the heavenly word as law while others are more likely to question it, hence the conflict between the team in the film’s third act. But in the comics, some Eternals decided they didn’t like this anti-breeding rule, so they went to Titan’s moon (hello, Thanos!) to be fertile and multiply or whatever, hence the idea of family between Thanos and Star Fox.
But wait, why does Thanos look…well…like Thanos, and Starfox looks like Harry Styles? That’s because Thanos’ birth was the product of his parents experimenting by mixing eternal and aberrant DNA. Hey, we just said they were brothers and not twins!
Pip’s announcement of Starfox also refers to him as Eros, which both nods to the Eternals’ tendency to have names influenced (or influenced) from earthly myths and legends, as well as his ability to manipulate the emotions of others. In addition, Eros is as tough as you’d expect from an Eternal, with serious durability, strength and possibly the power of flight (although that didn’t seem obvious with every member of the cinematic Eternals).
Please correct me if I’m wrong, but Pip introduces Starfox as coming from “the Mystery Planet” and as the killer of “Black Roger”. If I heard correctly, that’s an incredibly deep cut, from an almost completely forgotten one Marvel Comics presents story in which Starfox defeated the ruler of ‘Mystery Planet’, who went by the name ‘Dark Roger’.
