He and Anakin became the best of friends and were seen as "two halves of a single warrior", as put by the novelization, but were fundamentally different as Jedi.

Source: https://collider.com/ahsoka-non-traditional-jedi-explained/

Like most of the Titans, he’s walked the Earth for thousands of years, and presumably in all that time he’s been channeling nuclear radiation, which, as shared in the novelization, originates from that strange energy source within Hollo Earth.

Source: https://www.cinemablend.com/movies/godzillas-going-pink-in-the-new-empire-cool-theory-about-color-change