Takuma Hasumi

Takuma Hasumi (蓮見 琢馬) is an enemy Stand user who only appeared in The Book: 4th Another Day novel, based on Diamond Is Unbreakable.

Appearance/Personality
Takuma is a killer with a slender build and a horse-shaped birthmark on his neck. He has the natural ability to memorize everything he sees, listens or senses all the time on the smallest details. Forced to remember things he wanted to forget, such as the pain of getting hit by a car, Takuma started to scratch his arms so hard to endure the pain he felt that they got permanent red marks on them. He had no control over his memories until he developed his Stand The Book.

To hide his arms, Takuma only uses long-sleeved jackets and refuses to take them off. He also is always seen with a pen, given to him by the Crybaby Boy. Takuma then decides to live a reclusive life, so he would be able to avoid getting much more data. He is usually described as being "a void without emotions".

History
Takuma is the son of Akari Hirai and Teruhiko Okami. When his mother died after giving birth to him, his father abandoned him in a temple. Takuma was then taken to an orphanage. The orphanage staff found out about his ability to not forget anything and though he was a genius, but were disappointed when they realized he could only store data, but not actually put them together to solve problems. His ability made his life much worse, as he could never forget anything in his head. Takuma tried suicide multiple times, but never succeeded, and so decides to live a reclusive life. He eventually develops his Stand, The Book, and so the memories once stored in his head were stored in the Stand, so he could remember anything in his life anytime he wanted just by looking at it. Takuma finds out that his mother died oppressed by Teruhiko and vows revenge.

The Book: 4th Another Day
Takuma kills his father's former lover Hanae Orikasa so he would come in contact. He then develops a friendship with Chiho Futaba, unaware that she's actually his half-sister. The Stand users of Morioh start a investigation on the death of Hanae, believing it to be the work of a Stand user, and Takuma ends up being chased by Okuyasu Nijimura. Even though he manages to defeat Okuyasu, Takuma decides to kill Josuke Higashikata due to his investigation, but his attack fails when Tomoko Higashikata is the one who picks up the letter with a page of The Book. Chased by her son, Takuma runs to the roof of the library and is defeated by him, ending up falling from the building to his own death wish.