He played Kro, the deviant leader in Eternals. He has already appeared in the MCU, though most audiences wouldn’t recognize him.
However, in the MCU, his fate could be different as he’d make for an interesting Ghost Rider. He set to do it again this year in John Wick: Part 4 as character the Marquis. Bill Skarsgård has become well known for playing villains and antagonists over the recent years, most famously, Pennywise the Dancing Clown in It and It Chapter 2.