#3 Aleister Black and Zelina Vega
Coming to the couples on the current WWE roster, Aleister Black and Zelina Vega is one of the rare few couples to have feuded against each other multiple times. While WWE loves to use real-life relationships of the Superstars in its storylines, the company has somehow decided not to do the same with Black and Vega.
As we know, Zelina Vega works as the on-screen manager of the current United States Champion Andrade. The two have been "business associates" since there time in NXT. It was at NXT TakeOver: New Orleans where Andrade went one-on-one with the Dutch Destroyer which resulted in Black winning the NXT Championship.
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After moving to the main roster, the two have crossed paths a couple of times, both on SmackDown as well as RAW with Zelina Vega being on Andrade's corner every time. In any case, it allows them to perform together on TV with their partners, even if it's in opposing corners.
There are chances that we might never see the two work as a team on TV as the character of Black is a lone wolf, who might not really benefit from the addition of Zelina!