The Disastrous Life of Saiki K.- Akechi Tôma I Genius

The Disastrous Life of Saiki K. (Japanese: 斉木楠雄のΨ難, Hepburn: Saiki Kusuo no Sai-nan) is a Japanese manga series written and illustrated by Shūichi Asō. Following a series of one-shot chapters published from 2010 to 2011, the manga was serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from May 2012 to February 2018. It was followed by a short serialization of 4-panel chapters published in the same magazine, and two one-shot chapters published in Jump GIGA in May and July 2018. Shueisha collected its chapters in twenty-six tankōbon volumes.
Touma Akechi (明智 透真, あけち とうま lit. Akechi Touma) was one of the very first friends Saiki Kusuo had in elementary school. He later transfers into PK Academy and is able to confirm the existence of Kusuo's powers.
Touma has been brutally straightforward since he was a child, and would always talk about whatever is on his mind. He relentlessly responds to anyone, like how he talked back to his classmate Takashi, despite continuously being bullied by him.
As a high school student, Akechi seems to have become more annoying to others, especially to Kusuo who can read minds. Touma's mind and speech flood with words, and the speed he thinks is the same speed at which he talks to others. There are two lines of thought and words coming out of Akechi simultaneously, and that makes it difficult to focus on one line for Kusuo.
He seems to have no shame about biology, providing inappropriate trivia and commenting on his history of urinary incontinence.