#1 Brock Lesnar

Brock Lesnar is one of those wrestlers who fits the Elimination Chamber stipulation perfectly. A beast, a destroyer, and a merciless athlete, his style of inflicting pain lend him all the credentials suited to this punishing structure. Even though he's been around WWE for almost a decade combined, Brock has never stepped into an Elimination Chamber.
One may forget that his initial run in WWE lasted only 3 years. Lesnar was a dominant force ever since he made his debut in 2002. Within 5 months of his introduction, Lesnar became the WWE Champion. Back then he was the youngest superstar to win the WWE Championship, a record which was broken later by Randy Orton.
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A second WWE run came calling for Brock in 2012, and he's been part of the main roster ever since. Although he has spent a majority of his second run as a World Champion, Lesnar never had to compete inside the Elimination Chamber. There is still a possibility that we may see the Beast Incarnate inside the structure, but given his contract and his lack of appearances, it might be a distant dream for all the fans.