Shuu Tsukiyama is an infamous Gourmet Ghoul who studies Social Welfare at Haruna Gakuin University's Department of Human Sciences. He has a unique personality and opulent tastes that he hides under the guise of being a gentleman and intellectual. As a ghoul, Shuu displays his arrogance as a predator seeking to devour the finest meals from his prey. His interest in European literature and language is evident in his mannerisms and dialog, which often includes borrowed English, French, and Italian phrases. Shuu becomes enraged when others disrespect his taste in food, such as when he shatters a teacup during a date with Kaneki at the coffee shop after remembering an encounter with Rize. Rize insulted Shuu's picky eating habits by suggesting that they made him seem more human than ghoul, which led to Shuu bearing grudges against her and calling her a "pig" for mocking his taste in food.
In Tokyo Ghoul:re, it is revealed Tsukiyama fell ill and became extremely thin after being led to believe Kaneki was killed by Arima. After finding out Kaneki is in fact living on as the Investigator Sasaki Haise, his health improved drastically and he was motivated to bring back Kanekis memories.
In Tokyo Ghoul:re, it is revealed Tsukiyama fell ill and became extremely thin after being led to believe Kaneki was killed by Arima. After finding out Kaneki is in fact living on as the Investigator Sasaki Haise, his health improved drastically and he was motivated to bring back Kaneki's memories.
When confronting Sasaki, he comes to the realisation that he enjoyed the time he spent with Kaneki, and cares for him deeply, to the point that he no longer thinks of him as just food- he accepts that Kaneki is living a better life as Sasaki even though it breaks his heart that he cannot protect him like he used to.
He was a member of the Ghoul Restaurant, known as "MM" until he betrayed them.