#1 The Undertaker

One of the greatest superstars of all time, he has already become a special attraction. It still gives people goosebumps when they hear the sound of the gong. He is a legend, he is The Phenom. It’s time for him to take his place among the rest of the legends.
It’s fortunate that his match against Brock at WrestleMania 30 wasn’t his last. Fans were legitimately concerned about his well-being after the fight concluded, as he got a concussion. He’s come back to have a great series of matches with Brock, and even knock off Bray Wyatt and John Cena at WrestleMania 31 and 34 respectively.
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It would be great to see him have one last match with Kane if John Cena is not ready for another match at WrestleMania, that would be an acceptable pairing.
Ideally, people will love to see The Undertaker vs John Cena one final time, with The Undertaker finally hanging up his boots. John Cena should get the win, with Taker getting the time in the ring for one last salute.
These three greats have given their blood, sweat, and tears to the WWE. They certainly deserve a proper send-off. Giving them the moment to shine either leading up to, or at The Show of Shows would provide WWE with an opportunity to thank them for their contributions, and let them gracefully ride off into the sunset.