#1.) Rey Mysterio
Rey Mysterio and Triple H ideally should have crossed paths, but their main interaction would be at the Royal Rumble 2006 match, where they entered at #2 and #1 respectively. Mysterio would go on to win that and a year later, Triple H would win a match on RAW that allowed the red brand to get the first draft pick.
That draft pick, of course, was Rey Mysterio himself. Since Triple H was WWE Champion, it seemed like they would inevitably cross paths, especially since it was teased that night. However, it wasn’t meant to be as Triple H was drafted to SmackDown a day later. They never met after that.