#6. Carmella and Corey Graves

While the two were in the midst of a controversy when their relationship was outed, the two would later go public and have been together since. Carmella is a former SmackDown Women's Champion, but her overall run hasn't seen her heavily featured on regular programming except for her first couple of years - the second half of which saw her become the first Women's Money in the Bank winner, which she would cash in 10 months later to become SmackDown Women's Champion.
Her run in 2018 lasted from the post-WrestleMania 34 SmackDown until SummerSlam, a run where she established herself as the top female heel on SmackDown. Her most notable run after that was her pairing with R-Truth - one that ended due to the brand split in 2019.
Corey Graves is the voice of SmackDown alongside Michael Cole and while he remains on the same brand as his partner, their relationship hasn't been acknowledged minus a few subtle jabs at Graves. Their relationship has been featured on Total Divas, but it's unlikely we'll ever see them together on WWE TV.