I came across this Reddit post describing ideas for additional class specialisations. One was for a ranged paladin, and I thought it was particularly interesting.
Normally ranged paladin variants play up the idea of paladin as holy spellcaster, the "shockadin". In the past we've even had spells like Denounce which allowed Holy paladins to try this playstyle. And it worked reasonably well for questing, but was never raid-viable. In Legion, Blizzard moved Holy paladin dps back to a melee-style, which I've found quite fun for questing. (Still not raid-viable, though.)
In any case, this ranged paladin variant isn't a spellcaster, but instead uses a two-handed crossbow. It fuses elements of a "witchfinder", inquisitor, or Van Helsing-style vampire hunter into the paladin. Having the paladin focus on a weapon reinforces the martial aspect, and witchfinders reinforce the religious overtones of the class.
Though crossbows would be the signature weapon, I imagine these paladins could also use bows and guns. It would also be nice for ranged weapons to be used by a class other than hunters. Though Blizzard would have to add Strength to ranged weapons.
A witchfinder might be an interesting idea for a new non-caster ranged class well, maybe wearing leather instead of plate. However, I wonder what specialisation options it would have. A paladin variant would be simpler.
All in all, this was a neat paladin variant, and one I'd love to see in-game.