#4 WALTER
It would make sense for there to be a representative of the NXT UK brand in the Royal Rumble match and there's no more obvious choice for that role than the United Kingdom Champion, WALTER, who also saw action at Survivor Series, though he was, unfortunately, the first man eliminated.
WALTER vs. Brock Lesnar would be another impressive sight that would add a lot of fun to the Royal Rumble match, to say the least. It would be stupid not to give the fans that kind of a spot, or at least something similar to it. A showdown between WALTER and Roman Reigns or Braun Strowman would be interesting too, for example.
Although NXT UK doesn't have a live television show like its mainline counterpart on the USA Networ, the company would be foolish to not try and boost viewership of it, especially after Worlds Collide. This means that it's very likely that we'll see WALTER in the Royal Rumble match tomorrow night. Maybe he'll get an elimination under his belt as well.