You had me at Keanu.

The official Star Wars: The Rise of Skywalker Visual Dictionary has revealed that Knights of the Old Republic's Darth Revan is now canon.

Star Wars: The Rise of Skywalker introduces new characters into Star Wars, but it also makes Knights of the Old Republic's Darth Revan canon.

It's theoretically possible that the Sith troopers in Star Wars: The Rise of Skywalker is Revan's Infinite Army that was frozen in carbonite.