#1 Brock Lesnar - Universal Champion

Brock Lesnar enters WrestleMania 35 as the Universal Champion. He will face the 2019 Men's Royal Rumble winner Seth Rollins. The previous WrestleMania also looked similar for Brock as he faced another Shield member Roman Reigns
He successfully defended his universal title amidst a lot of rumors that he would lose. There were reports that he was leaving WWE after WrestleMania 34. However, Lesnar retained the title at the PPV and signed a new deal with the company shortly afterward.
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Maybe the management's decision to have him as the titleholder after WrestleMania impressed him to remain with them. Who would choose to leave a company that treats them like a big deal anyway?
If Brock had lost the title back then, he would've indeed left them in a short while. The company's treatment of Lesnar during the previous WrestleMania and beyond that makes us think that he might be retaining again this year.