Pete Dunne
The Bruiserweight is of the fastest rising stars in the WWE, and after his appearance at the Royal Rumble, it's clear that he's a top star in the making, so this would be a great way to give the wider WWE Universe a true look at his in-ring skillset. Sure, most people expect the cruiserweights to put on fast-paced bouts, but Pete Dunne doesn't work that style, and alongside The Best Kept Secret, that could work.
He still has priorities in NXT UK, but if the company keep pushing the longest reigning champion in the modern era, he will be a star in no time, and this is a great way to give him more exposure without pushing him too high, too fast. The style of the bout with Buddy would be completely different to what Ricochet would present, but both of them would be great, and if WWE really believes in 205 Live, this is the way to go about it at WrestleMania.
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At the end of the day, the WWE is likely going to do what we expect and give us a multi-man match or a basic singles match on the pre-show, but 205 Live and Buddy have earned more than that, and the fans would love to see a big bout, even if it is just an exhibition and not for the cruiserweight title.