#3 'Demon' Finn Balor
It is the name of Finn Balor's dark persona, in which he would erratically slip, in major matches to make it feel more special. It is basically his alter-ego which makes him more powerful and gives him a slight edge over his opponent. WWE has not bothered to explain anything about it, which makes this character insignificant. Balor obviously looks much stronger when he comes in as Demon in any of his matches, but writers have still not made an effort to explain as to why does Balor go his darker side. Last time Balor came as Demon was in Summerslam 2018 to face Baron Corbin. This match has a weak storyline and in the build-up to the match, we can clearly see Finn was more powerful of the two and Baron was a coward heel. So, he surely didn't need the help of his 'Demon' gimmick to defeat him.
I am fine that he uses the gimmicks on special occasions but what baffles me is that on Raw the next day, when Roman Reigns challenged him for Universal Championship, he came to the match as Finn Balor. Roman is quite obviously, a tougher opponent than Corbin and the match was for the most coveted prize in WWE. WWE needs to explain the reason for the 'Demon' Finn Balor's appearances otherwise, this gimmick is just going to be another failed experiment