A list of very important canon facts about Tsukiyama:
Tsukiyama once spent a whole day looking at his reflection in the mirror.
Tsukiyama owns at least one pair of heart-patterned boxers.
Tsukiyama is so good-looking that Kaneki’s first impression of him was that he looks as a model.
Tsukiyama was so popular in high school that his fan girls were bullying Hori for being so close to him.
Hinami calls him ‘Flower Man’ because he often brought bouquets of flowers to Kaneki’s apartment.
Tsukiyama coughed awkwardly after seeing Kaneki shirtless.
Chie teased Tsukiyama about trying to win Kaneki’s trust by using money and pretty much called him a sugar daddy.
Tsukiyama plays the piano so well that he can make a decent living out of playing in jazz bars.
One time, Tsukiyama got drunk with Yomo and ranted about eating Kaneki. After that he started rambling about how Kaneki is “different” and “amazingly incredible”.
And yes, Tsukiyama is a very loud and emotional drunk.
Ishida Sui suggested that Tsukiyama may have made Kaneki’s battle suit for him.
Tsukiyama wanted to live with Kaneki and his group.
Tsukiyama once stuck a flower on Banjou’s head.
When Tsukiyama was little, he used to play Chopin while screaming at the top of his lungs in order to calm himself down.
Tsukiyama has called Kaneki his “master“ on numerous occasions.
If Tsukiyama ever had the chance to dress Kaneki up, then this is probably what he would make him wear.