#5 Shinsuke Nakamura
One of the hottest free agent signings in WWE history (and isn't it sad to think about his place in the company now), Shinsuke Nakamura came to NXT from New Japan Pro Wrestling. Nakamura debuted to huge fanfare and his first match was against Sami Zayn.
Nakamura defeated Samoa Joe at TakeOver: Brooklyn II. Nakamura reigned for 91 days before losing the title back to Joe. After winning the title back, Nakamura reigned for another 56 days before dropping the title to Bobby Roode.
Nakamura was charismatic, captivating, and utilized strong style wrestling that gave his matches a big fight feel and since of realness.
#4 Kevin Owens
Kevin Owens is one of the best heels in the world. Remember when I said anyone that beat Sami Zayn would be public enemy number one? Insert KO. Owens debuted as Zayn's best friend, then quickly turned the tables when he descimated Zayn after winning the NXT Championship. Making it clear the the title was more important to him than friendship, Owens found himself across the ring from Zayn at TakeOver: Rival.
Owens won the title due to referee stoppage when it was determined that Zayn could not continue the match. Owens reigned for 142 days and would debut on Monday Night Raw with the NXT Championship, lay out John Cena, and stepped on the United States Championship.
Making a name for himself and bringing exposure to the NXT Championship, Owens is the first superstar to ever debut on the main roster with the belt (Rollins did not bring the belt with him when he debuted with the Shield).