Saiki Kusuke

Kusuke Saiki (斉木 空助, さいき くうすけ lit. Saiki Kūsuke) is Kusuo's older brother, a super genius who likes to invent machines/devices. He is 2 years older than Kusuo.

Appearance
Kusuke, like Kusuo, was born with a different hair color than his parents. He has yellow-green hair and slightly darker eyes. He wears his "Telepathy Canceler" whenever he is around Kusuo. When working, he is mostly seen with his machines, wearing a typical white lab coat worn by scientists. When in school, he wears a long black robe with a white collar buttoned up, and while on his days off, he wears normal clothes such as a t-shirt and pants.

Personality
Kusuke is prideful and competitive when it comes to Kusuo. He would have done anything to win against him when they were kids. However, he would always lose against his little brother. Thus, he became addicted to playing/fighting with Kusuo. Kusuke is a sadist, as shown when he enjoyed seeing Kusuo, Shun and Riki being chased by crowds of people. Kusuke is also obsessed with Kusuo and can be attention seeking and selfish. This is best shown when he made a time machine to go back 20 years in the past when Kusuo was still alive (in this chapter, they were in a parallel universe where Kusuo had died ) and when he made Kokomi cry by saying that she and Kusuo were not fit for each other.

He is also deceitful, always showing an angelic smile towards their parents. He ignores his father, just like Kusuo. Kusuo always thought that Kusuke hated him, but Kusuke cleared this up and told Kusuo that he only liked to tease him.

Trivia

 * Like the rest his family, Kusuke's name is a pun on Psychics (サイキックス Saikikkusu).
 * He created the limiter devices that Kusuo wears.
 * He studied in college in Cambridge before graduating.
 * He has an IQ of 218.
 * Similar to his brother, he is immune to Kokomi's beauty.