Eobard Thawne, also known as Professor Zoom, the Reverse Flash, is a villain who has died on multiple occasions, only to return by various means. Considering only the comic books, let's catalog his deaths:
1. Neck broken by the Flash (Barry Allen) back in 1983.
2. Impaled by sword wielded by Thomas Wayne Batman in 2011.
3. Disintegrated by Dr. Manhattan TWICE (in the same comic) in 2017.
I feel like I'm missing a few.
Buried Alien (The Fastest Post Alive!)