Chloe Zhao’s Eternals will be introducing the god-like heroes, The Deviants, and explaining The Celestials in bigger way than previous MCU projects. She’ll also give us an odd character as well, Dane Whitman played by Game of Thrones star Kit Harington.

Dane Whitman in the comics is known as the Avengers member Black Knight, however, in the trailer he seems like a normal human without any powers to speak of.
Well, that seems to be the case according to Harington in a new interview with Total Film suggesting that he’s a “normal” human and doesn’t giving the impression he’ll have powers, rather that his relationship with Gemma Chan’s Sersi will be the focus (there have been reports of a love triangle plot).
“The human character of the story. He’s not an Eternal. He’s a character who works with the Natural History Museum in London. But he’s not an Eternal – that’s the main takeaway!”
“I’ve got no idea whether my character goes on or not. I had read up on who he could be, or might be. So there’s the possibility for a longer trajectory. And hopefully, I think this is the tip of the iceberg for my character. I hope. But I just don’t know, you know? I’m as in the dark as anyone else. And I try not to live too far ahead in the future with anything. Even when I was in Game of Thrones, even on the sixth season, I presumed the seventh season wasn’t going to happen!”
Harington could certainly be playing coy, but officially there haven’t been any announcements concerning a Black Knight series or film project being in the works. That doesn’t mean that couldn’t change in the near future.
Maybe they’ll attempt to tease Black Knight at the end of Eternals with The Ebony Blade?
A magical blade forged by Merlin and Sir Percy from the Starstone meteorite. The Ebony Blade was enchanted to cut through any object, to prevent the death of its wielder, and to deflect any magic, but it also carried a curse that would slowly corrupt any user and cause a lust for violence, bloodshed, and death.
Black Knight could allow Marvel to venture more into the world of Arthurian/Sword & Sorcery genres, a big departure for the studio as a majority of MCU projects skew in the realm of action sci-fi. Shang-Chi had one of the first examples of true fantasy with the Ta-Lo sequences.
ETERNALS – The immortal heroes, the Eternals, came here 7,000 years ago, since the dawn of man, to “protect humans from the Deviants.” Sersi reveals that she hasn’t seen some of the other Eternal teammates for centuries. With the monstrous creatures, the Deviants, long thought lost to history, mysteriously return, Ikaris decides that it’s time for them to “find the others” and defend humanity once again. As the epic story unfolds, Sersi and Ikaris reunite with Kingo (played by Kumail Nanjiani), Sprite (played by Lia McHugh), Gilgamesh (played by Don Lee), Thena (played by Angelina Jolie), Makkari (played by Lauren Ridloff), Phastos (played by Brian Tyree Henry), and Druig (played by Barry Keoghan).
SOURCE: TOTAL FILM