5 WWE Hall of Famers Roman Reigns has surpassed with his combined reign of 651+ days

#2 WWE Hall of Famer Stone Cold Steve Austin

Stone Cold Steve Austin was instrumental in WWE defeating WCW in the Monday Night War. His career was cut short in 2003 due to a neck injury, as well as several knee injuries. Austin headlined three WrestleMania events during his run as the company's top star, and won the top title on six occasions.

Austin was world champion for a combined 524 days across his six reigns, and defended the belt 27 times. He was inducted into the Hall of Fame in 2009.

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#1 WWE Hall of Famer Edge

Edge retired from WWE in 2011 due to a nagging neck injury. In one of the biggest feel-good moments in wrestling history, he made his big return at Royal Rumble 2020, and came incredibly close to winning it all.

Edge is one of the most decorated superstars in history. He carried SmackDown on his shoulders as a top heel, back in the late 2000s. The Rated-R Superstar has won 11 world titles in Vince McMahon's promotion, with a combined reign of 540 days. He was inducted into the Hall of Fame in 2012.

Edge is the only Hall of Famer in this list who has a slight shot at keeping up with Roman Reigns in terms of combined days as top champion. He is currently an active star on TV and is currently feuding with The Miz.

It looks highly unlikely, though, that WWE will give the top title to Edge and keep it on him for an extended period of time, at this stage in his career.