Goumasa Tokage

Goumasa Tokage was a Investigador Ghoul serving Cochlea and he was known for his sadistic and psychopathic tendecies. And while he tortured Yamori while he was in prison, but he lost control, which caused Yamori to escape, and after that he was fired from office, and worked as an instructor at the 2nd Academy.

Plot
Goumasa Tokage was an interrogator who worked at the Ghoul Detention Center, and during that time he was assigned to interrogator a ghoul named Yakumo Oomori who had large amounts of knowledge of the 13th ward. He then began to torture Yamori in a cruel and inhuman manner for an unspecified number of days in captivity. However, Yamori manages to break free from prison and took advantage of the situation to take revenge on his interrogator by torturing him, returning the pain to him.

After Yamori's escape, he worked at CCG Junior Acadermies. However he continued with his psychopathic habit of killing and maiming animals, he killed 10 dogs and 40 cats and other smaller animals, after one night he threatened to kill Suzuya if any information had been leaked about him. However, Tokage was exposed and fired from CCG, after Tokage discovers Mutsuki who was hiding inside a tree grove and small pool of blood, he watches Mutsuki desmenbering a stray cat, and then provides advice on how to do so.

Rose Extermination
Sasaki goes to the 2nd Academy to give a lecture as Tokage approaches him and asks about Mutsuki, in which he describes him as a former student and a troubled child. And he expresses dark amussement as he hears that Mutsuki is training a former student with Suzuya as he walks away, and while Sasaki shows a twirl around him, while Tokage breaks his fingers the way Yamori did before.

End
In the days following Dragon's emergence, he continues to work as an Acadermy Instructor, and his actions came to an end when one of his students stabbed him to death.