#3 Diamond Dallas Page
Diamond Dallas Page has been a renowned name since the WCW days, and then he joined WWE where his move 'Diamond Cutter' became a success. During his time in the company, he did win some championships and entertained the fans in the process.
After moving out of the ring, he started a company named DDP Yoga which focused on various yoga moves that would be essential to one's safety and health. With his innovative yoga moves, he has helped a lot of wrestlers and the common public.
Chris Jericho, AJ Styles, and Steve Austin are some of the most notable wrestlers who have benefited from his DDP Yoga. His program came into light when he saved Jake 'The Snake' Roberts, and was lauded by the wrestler as well as other celebrities.
While there are no credible chances of him coming to the Royal Rumble, you can never count him out.