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 weak). In some cases, an "~" may be 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
 * SS~: Seidou Takizawa
 * SS: Big Madam, Roma Hoito, Kaya Irimi, Matasaka Kamishiro, Ken Kaneki/Haise Sasaki, Ayato Kirishima, Donato Porpora Noro
 * S~: Nishiki Nishio
 * S: Bin Brothers, Demon Yamada, Rize Kamishiro, Miza, Naki, Nutcracker (after Ch. 23), Yakumo Oomori, Shuu Tsukiyama, Wobbegong
 * A~: Hooguro, Nutcracker (until Ch. 23), Shousei, Uruka Minami
 * A: Karao Saeki, Skull Masks Leader,
 * B: Akashi Kobayashi, Average Aogiri Tree member
 * C: Scarecrow