Mirumo Tsukiyama

Mirumo Tsukiyama (月山 観母, Tsukiyama Mirumo) is an extremely wealthy and eccentric Ghoul, well-known within Ghoul society for being extravagant. He is the father of Shuu Tsukiyama, and took part in the Auction as a major bidder under the alias Croque Monsieur (クロックムッシュ, Kurokku Musshu).

Appearance
He is an elegant older man, with a well-groomed moustache and small-rimmed glasses. He wears finely-tailored clothing.

Personality
Mirumo Tsukiyama is known as an extravagant ghoul and acts like an upper-class citizen even within the ghoul society. He has shown compassion for his own son's deprived state ever since the Anteiku Raid; he refers himself as "papa" when speaking of his son. He also seems to have a habit of screaming out of a window when he doesn't know what to do.

As a prestigious family's head, Mirumo holds every aspects of the demeanor of a typical gentleman. He does not resort to violence during struggles and prefers to talk things out, or even simply give up and surrender when he knows it is inevitable for him to lose as seen from the beginning of the Tsukiyama Family Extermination Operation.

The Auction
He first appears at the auction, competing fiercely with Big Madam for a famous actor. He wins their competition, and offers an apology to her for having won. Ayato Kirishima seems familiar with him, offering an explanation when asked about the winning bidder.

When Tooru Mutsuki is placed up for auction, he takes part in the bidding war against Big Madam and Kanae von Rosewald. Ultimately, he drops out of the competition prior to the final bid.

In the aftermath of the Auction raid, he escapes with his servants. Though having lost out on the opportunities the Auction presented for finding "ingredients", he states they will continue working for his son's sake.

Rosewald Investigation
When Mirumo's son got better and began going outdoor again, he expressed joy in the news. He is later seen with a few other family servants and Shuu listening to Matsumae about the hunting team's failure that led to Yuuma's capture.

Noticing that there are doves marching towards his manor, he casually brews his son coffee mixed with soporific drugs to keep him safe by ordering Matsumae to take care of him.

Mirumo waits at his mansion's lobby for Special Class Ui to enter, conversing with him casually in a respectful fashion while said investigator is filled with suspision and ill will towards him. Mirumo then states that he will not run or fight, as he is willing to surrender under the conditions of "living as a human" until the very end, as he has before in his entire life. He is then seen being escorted by several investigators away, binded with handcuffs and belts.

Shuu Tsukiyama
Mirumo is an extremely caring father, deeply concerned for his son's well being and proud of his many accomplishments. His diary entries show that he feels responsible for his son growing up without a mother, and tries to make up for this through loving his son enough for both parents. He worries greatly for his son's well being, and has taken an active role in searching out some "ingredient" that will make his son's health return. After his son's recovery, he is greatly relieved.

Kanae von Rosewald
Kanae is one of his servants, working at his behest to care for his son.

Matsumae
She appears to be a highly trusted servant, given responsibility for his son since an early age.

Tsukiyama Group
Mirumo is the grestly respected head of the Tsukiyama group, which consists a significant number of ghoul employees. Many of these employees and company heads owe a great deal to Mirumo for his generosity and assistances over the years, and are fully prepared to sacrifice their own lives for their benefactor's successor's escape from the CCG.

Trivia

 * His namesake is actually a French grilled ham-and-cheese sandwich.
 * In his diary, it's revealed that Mirumo doesn't want for Shuu to end up as a playboy, like the boy's grandfather. But instead, wants that his son find a noble ghoul lady and get married.