#3. Killian Dain and Nikki Cross
Killian Dain and Nikki Cross are a couple that has been consistently overlooked throughout their WWE careers. Both stars debuted in NXT together as part of Sanity, before Dain was promoted to the main roster with Eric Young and Alexander Wolfe, whilst Cross remained on NXT to work in the Women's Division.
When Cross was then promoted to the main roster, Sanity was separated between different places with Cross heading to Raw, Dain returning to NXT and Alexander Wolfe moved to NXT UK to become part of Imperium.
Cross and Dain have stood the test of time, though, unlike many of the couples on this list. The duo are still on separate brands in WWE, but were married last year. Nikki Cross has been heavily featured in the WWE Women's Tag Team Championship picture throughout her time with Alexa Bliss. Dain, meanwhile, has remained on NXT following an impressive feud with former United Kingdom Champion Pete Dunne.
Hopefully one day Cross and Dain will be drafted to the same brand so that they have the ability to spend more time together. This is something that is already granted to most modern day WWE couples after all.