It's got to be Kane! Due to the shortness and pointlessness of his reign.
Kane's reign was entirely pointless. And it makes it even worse that it was his ONLY WWF/E title reign.
Yokozuna or Bob.
That's basically off of name. Those two are rarely talked about, if it all compared to everyone else
Backlund, hands down, for reasons already stated.
FUN FACT: One of the people wrestling in the main event of the last pay-per-view has "Yokozuna" as his middle name:And is somehow 31. Thought he was at least mid 30s.
https://en.wikipedia.org/wiki/Solo_Sikoa .
Either Bob Backlund or Sgt Slaughter. Both were just used as transitional champions to get the belt from a babyface to a babyface. Bob gets the nod for only having it for a few days, and losing it in a total squash to Diesel.