Top 3 D-Rank

Among the Regulars that entered the Tower, three individuals were said to be the top three strongest D-ranked Regulars at a time. To attain this title, it was assumed to revolve around the known acts that each had done to display their powers and abilities as the strongest based upon on fights, power, achievements

Given the special examination of the Hell Train, which only D-ranked regulars may make, these Regulars are somehow linked to the Hell Train. Because of this many regulars refers them as the "Three Top Predators" onboard the train.

Names of the Top 3 R-Rank Regulars
So far, only two of the top three strongest D-ranked Regulars have been revealed:
 * Kaiser, the "Name Hunter" and leader of the Name Hunt Station.
 * Sachi Faker, the "Ticket Hunter".

Notes and Trivia

 * Although not in the same league, Aka Willian can be considered a fearsome D-rank regular.