Kasuka Mado

Kureo Mado's Wife
She is the wife of Kureo Mado, a First-Class Ghoul Investigator that works at CCG. At Chapter 28, where Kureo's last moments were within, states that he still has to get revenge on the One-Eyed Ghoul. However; at that very moment, ha passed away, and Touka Kirishima pulled out his left glove; complaining about the Ghoul Investigator's disgust about them ghouls. Touka's eyes widened when she saw Kureo's ring on his ring finger, but brushed it off as Yomo and Kaneki Ken arrived.

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This is just a wild guess, but, various readers have thought that Kureo purged revenge on the One-Eyed Ghoul because he killed his dear wife.