#1. Could turn heel: Ricochet

Admittedly, this one is the most bizarre on the list and the least likely to happen. Ricochet has established himself as a babyface since his time in NXT and his high-flying, flashy skillset and "Superhero" gimmick likely prevents WWE from turning him heel.
However, there are various factors to look at when taking these things into account. If Ricochet's merchandise sales are through the roof, it's unlikely that WWE would turn him heel. He's essentially Brock Lesnar's "filler" WWE Championship feud until he gets to Drew McIntyre at WrestleMania 36, which means that he hardly has a chance of winning.
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We expect him to have a decent showing. Usually, when Lesnar faces smaller opponents, he has a much better match. His 2017 and 2018 Survivor Series classics against AJ Styles and Daniel Bryan are examples, while his 2019 bout against Rey Mysterio was short but brilliant in its own right.
There could be a possibility of a post-match heel turn for Ricochet, either becoming McIntyre's post-WrestleMania feud or WWE simply trying a new direction with him.