Rating

Ratings  are a system used by the Commission of Counter Ghoul to classify Ghouls with respect to their perceived individual ability and threat level.

Definition
Ghouls are rated based upon various factors, including their basic strength, activity level, and how hostile they are towards Investigators. There are six rating levels, from SSS (the most powerful) to C (the weakest). In some cases, a "~" is added to the base rating. This indicates that the Ghoul is estimated to be at least that strong, but the rating may change once more is known about the subject.

Rating Assessment Criteria
The rating of a ghoul is set through evaluation of the ghoul's individual ability. The following criteria are employed to determine the rating according to their individual ability:
 * The criteria for SSS ratings are unclear.
 * Multiple Special Class Investigators are needed to deal with an SS-rated ghoul.
 * The ability of an S+-rated ghoul is (appears to be) equivalent to the ability of an average Special Class Investigator.
 * The ability of an S--rated ghoul is (appears to be) equivalent to the ability of an average Associate Special Class Investigator.
 * An A-rated ghoul is comparable to a First Class Investigator.
 * A B-rated ghoul is comparable to a lower-ranked Investigator (Rank 1 to Rank 3).
 * A ghoul of smaller ability is C-rated.

In addition to the ghoul's individual ability, the actual damage caused by the ghoul is also evaluated. The rating is set in consideration of the predation and killing incidents committed by the ghoul.

For some ghouls their influence over other ghouls is also taken into account when ratings are given.

Known Ratings

 * SSS: Eto Yoshimura (One-Eyed Owl), Yoshimura (Non-Killing Owl)
 * SS+: Seidou Takizawa (Owl) (after :re Chapter 60)
 * SS~: Noro, Tatara, Seidou Takizawa (Owl) (until :re Chapter 60)
 * SS: Big Madam, Hinami Fueguchi (Yotsume), Roma Hoito, Kaya Irimi (Black Dog), Matasaka Kamishiro (Shachi), Ken Kaneki/Haise Sasaki (Eyepatch/Centipede), Ayato Kirishima (Black Rabbit), Donato Porpora (Priest) and Kurona Yasuhisa(Floppy)
 * S~: Nishiki Nishio (Serpent)
 * S: Bin Brothers, Demon Yamada, Eto Yoshimura (Bandaged Guise), Rize Kamishiro (Binge Eater), Miza Kusakari (Three Blades), Naki, Nutcracker (after :re Chapter 23), Yakumo Oomori (Yamori/Jason), Shuu Tsukiyama (Gourmet)
 * A+: Yumitsu Tomoe (Grave Robber), Hooguro, Shousei Idera
 * A~: Nutcracker (until :re Chapter 23), Shikorae
 * A: Karao Saeki (Torso), Skull Masks Leader
 * B+: Akashi Kobayashi
 * B: Average Aogiri Tree member
 * C: Scarecrow