The Rookies Four (若手四王, Rūkīzu Fō) also known as the Four Young Kings, is the title that was given to the four young Devils consisting of Sairaorg Bael, Rias Gremory, Sona Sitri, and Seekvaira Agares, who are famous for having strong peerages despite being young devils, which are comparable to mature Rating Game players.
First mentioned in Volume 14 by Mephisto Pheles and later explained by Ravel, the Rookies Four refers to the four Devils - Sairaorg, Rias, Sona, and Seekvaira as "a generation gathered with promising rookies that are on an exceptional level".
Ravel also mentions that something like this has never occurred before in the history of the Underworld. She claims that the Rookies Four and their servants belong to something which is out of the ordinary, mostly because they are still starting young Devils who have still yet to mature. Azazel mentions that the reason for the exceptional abilities displayed by the Rookies Four and their servants is due to training.
Most pure-blooded Devils would not train; instead, they would depend entirely on the demonic powers that they inherited and would simply trade off any of their servants that they deemed weak. However, the Rookies Four would rather train their servants instead of making trades with other Devils.
|A member of the Rookies Four and heiress of the Gremory Clan. She is the younger sister of one of the Four Great Satans; Sirzechs Lucifer. Her peerage is noted to focus heavily on offensive power, though are vulnerable to technique or counter type opponents. Her most famous servant is Issei Hyoudou, the current Red Dragon Emperor.||Gremory Peerage||Gremory Clan||Ultimate-Class Devil||Pure-Blood Devil||Alive|
|A member of the Rookies Four and heiress of the Sitri Clan. She is the younger sister of one of the Four Great Satans; Serafall Leviathan. Her peerage is noted to focus heavily on technique and counter types, as it is stated that her peerage has great overall balance. Her most famous servant is Genshirou Saji, the current host of the Prison Dragon; Vritra.||Sitri Peerage||Sitri Clan||Ultimate-Class Devil||Pure-Blood Devil||Alive|
|A member of the Rookies Four and heir of the Bael Clan. He is the son of the current leader of the Great King Faction: Lord Bael. His peerage is noted to balanced, as it focuses on offensive power which is enhanced by the techniques and abilities of the other peerage members. His most famous servant is Regulus, the avatar of the Longinus Sacred Gear; Regulus Nemea.||Bael Peerage||Bael Clan||Ultimate-Class Devil||Pure-Blood Devil||Alive|
|A member of the Rookies Four and heiress of the Agares Clan. She is the daughter of the current Archduke: Lord Agares. Her peerage is noted to focus on support and technique types. Her most famous servant is Alivian, a Dragon from the dragon tribe Zmei.||Agares Peerage||Agares Clan||Ultimate-Class Devil||Pure-Blood Devil||Alive|
- The other name for them is "The Four Novice Kings".
- All of the Rookies Four were participants in the Youth Devil Rating Game Tournament, where they displayed their Rating Game prowess which lead critics to notice their abilities.
- Two of the members of the Rookies Four are related to the current Satans, one is a member of the Great King Bael clan and Great King Faction, and one is a a member of the Archduke Agares Clan.
- All members of the Rookies Four have servants that have connections with Dragons.
- All of the Rookies Four were promoted to Ultimate-class Devil at the same time in the aftermath of the Hell Disaster.
- Among the Rookies Four, it is noted that only the Gremory and Bael peerages are powerful enough to engage in direct combat with the upper echelons of the Khaos Brigade leadership.
- Gremory and Bael peerages possessed Longinus users.
- Sairaorg is the only male member of the Rookies Four.
- Seekvaira is the only member of the Rookies Four to not have any known siblings.