Ken Ishiyama

Ken Ishiyama, also known by his hero name Cementoss (セメントス), is a Pro Hero and member of the U.A. High School faculty where he teaches Modern Literature.

Appearance
Cementoss appears to be a humanoid block of cement with black, seemingly shut eyes and gray hair tied into a short ponytail. His body shape is evenly blocky all around his body. His eyes are generally closed (but tiny when opened) and his lips are pulled upwards. His hero costume consists of a sleeveless brown suit that includes yellow stripes, shorts, and an elongated collar. He also sports gray shoes with yellow soles.

Personality
Cementoss is an often serious yet pleasant individual. He is very careful of the well being of others. He did not allow Eijiro Kirishima to compromise All Might's identity and also wanted to stop the match between Izuku Midoriya and Shoto Todoroki, noting that Izuku's injuries were serious enough to stop the bout.

Abilities
Modern Literature Expertise: Ken teaches high school modern literature. This suggests that he is well versed in the subject.

Quirk
Cement (セメント): Ken's Quirk allows him to manipulate any cement-based material that he touches, allowing him to deform the object into various shapes and sizes, changing its appearance. His Quirk doesn't appear to have a time limit, and Recovery Girl mentioned his Quirk is among the most difficult of the U.A. teachers to fight against.

Ken is shown to have a superior handle over his Quirk, what with him being a Pro Hero and U.A. teacher. He continuously is seen creating multiple, towering vertical slabs by touching the concrete ground with his hands. The slabs are seen to be able to withstand a considerate amount of damage, shown when Rikido Sato and Eijiro Kirishima had a hard time overcoming his ongoing walls during the exam.

Equipment
High Density Weights (Final Exams Arc): Cementoss and the rest of the teachers use these bracelets to give themselves a handicap while they are fighting their students.

Toshinori Yagi
Cementoss considers himself a big fan of All Might despite the fact that he is also a Pro Hero. Like the rest of the professors at the U.A. He knows his secret identity and he does his best to prevent others from discovering it. He also knows about All Might's stomach wound and how this limits his ability to use his Quirk, so Cementoss cares about his health and advises him not to overdo it when he performs his duties as a hero.

Chapter Appearances

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Trivia

 * Ken's surname contains the kanji for "stone" (石) and "mountain" (山), and his first name contains "stiff, firm, hard" (堅).
 * "Cementoss" is possibly a combination of "cement" and "toss".
 * According to Volume 4:
 * He's a big fan of All Might.
 * He likes round things (whilst being, ironically, blocky).
 * His favorite food is manju.
 * On his profile in Volume 4, the author commented that he should have given Ken's hair a crew cut.
 * Cementoss shares his first name with Ken Takagi, the "Pro Hero: Rock Lock".
 * He shares the same Japanese voice actor with Masaki Mizushima, otherwise known as "Normal Hero: Manual".

Quotes

 * (To Eijiro Kirishima and Rikido Sato) "Listen. When it comes to fighting... It's all about making use of your particular strengths."
 * "Whatever happens...we must stake our lives on the job!"

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