#2 Not used on WWE TV: Titus O'Neil and Batista
Batista is hands down one of the greatest World Heavyweight Champions this industry has ever seen. The Animal made a name for himself while being affiliated with Evolution, and went on to defeat Triple H at WrestleMania 21 to become the World Champion for the first time in his WWE career. Titus O'Neil, although didn't achieve the level of fame that Batista did, still managed to secure a spot in WWE for himself. He has been with the company for over a decade at this point.
Batista and Titus are very close in real life. Back in 2016, Batista called Vince McMahon out publicly after the boss suspended Titus for grabbing his arm live on WWE TV. The incident had taken place on an episode of RAW mere days ago, during Daniel Bryan's retirement ceremony. O'Neil was suspended by WWE for 60 days as a result of the incident.
A staunch supporter of BLM, Batista recently teamed up with Titus and the duo interviewed two police officers soon after the murder of George Floyd became national news. On WWE TV though, the duo never had a stint together, which was primarily due to the stark difference in the star power of the two, and their standing on the main roster.