Saiki Kusuo

"Good grief. (やれやれ yare yare)"

- Kusuo's common catchphrase.

Kusuo Saiki (斉木 楠雄, さいき くすお lit. Saiki Kusuo) is the main protagonist of the series who has all kinds of psychic related abilities. He usually tries to avoid getting into troublesome situations. His trademark appearance contains his green-tinted glasses and two pink antennas located slightly above each ear, which have the function of limiting his power. In the beginning, he was always seen alone but as the story progresses he eventually gets along with his schoolmates, especially Riki and Shun. Kusuo was starred by Yamazaki Kento in the live action movie based on the series.

Appearance
Kusuo wears a limiter on both sides of his head which is never removed unless it is absolutely necessary or by accident. During the days he has school, he wears the standard PK Academy uniform that all male students wear. On his days off from school, he occasionally wears clothes that are sewn by his mother. However, there are times he is forced to buy clothes since his mother has an interesting taste in clothing patterns.

Kusuo's appearance is not limited to that of a male, as he can also transform into anything (but it takes 2 hours to transform.) While in his female form, Kusuo goes under the name Kuriko (formerly Kusuko ). In this form, he has lighter pink hair, lacks visible limiters, wears glasses (although not tinted green) and usually wearing the female standard PK Academy uniform. In his cat form, Kusuo is known as Psi and has white fur. In this form, he still wears his glasses and his limiter is in the form of a collar around his neck.

As a child, depending on the time period, Kusuo does not wear any limiters nor his glasses, showing his violet colored eyes. He has striking dark pink hair, that differs from both of his parents and the rest of the world, until he used mind control.

As of the finale, he no longer wears his limiters or glasses. However, right in the end of the epilogue chapters, he reprises them due to his powers begin to return.

Personality
As the main character and the story is nearly driven by his narrative, Kusuo is a full, round character that changes over the course of the series. When Kusuo was a child, he was more open to his emotions. Part of it was due to the fact that he was unaware of what his powers did, such as breaking a whac-a-mole machine in an arcade and thinking the machine was giving him praise. He was highly mischievous, such as making his parents look for him for 5 hours after he teleported, and smiled around others without a second thought. However over the course of time, with having to hide his psychic powers from others and his abilities slowly ruining experiences for him, he started to close himself up. Thus, in the present, Kusuo is reticent. He hates being the center of attention, is quite reserved, and rarely uses his voice, instead preferring to project his words via telepathy into the minds of others.

Kusuo is unselfish, most of the time, preferring to let others have happiness over himself. He gave up his coffee jelly to get a baseball back to a child, gave Chisato a plane ticket to Okinawa knowing that it will lead to Kokomi winning her way, and preferring to let his father be him, himself being left alone, just so he does not ruin the fun for the other characters. Due in part of this trait, it tends to make him hate burdening or owing a favor to someone. He always helps Kineshi after he helps him and was visually disappointed in himself for making his mother keep his abilities a secret. With these characteristics in mind, others that know him well, as well as himself consider him as a tsundere. He is also responsible. He helps with chores around the house, such as cleaning and doing groceries. Despite being able to get anything he wants without using any money, Kusuo uses and saves money to buy something he wants, like the Coffee Jelly Maker. He is capable of cheating in exams to get a good score, but he decides to get average scores to avoid attention. Most of all, he tries heavily to not rely on his powers, wanting to achieve things for himself.

He has some faults. While he is quite intelligent, he lacks some common sense on some concepts, especially when it involves emotions and the internet. Once he nearly got scammed by an online shop, believing an item would be cheap and didn't check for delivery details. He can easily be manipulated with any sweets, especially coffee jelly. He likes to pry on the other characters. A big topic he likes to pry the most is love. While he has stated that he personally does not think he will not fall in love, he likes to watch it happen to others and helps them if he can. Such examples be him deciding to spy on Chiyo and Shun walking together the day after Valentine's Day and helping Satou Hiroshi with his crush on Suzumiya Hii. Some other characteristics include being stubborn, pessimistic, and a bit of a hypocrite. As time progresses, he grows from not have any friends in his first year of high school, having no single thought of becoming close to anyone, to later thinking of himself as a friend of several of his classmates after much pestering from Riki, Shun, Kineshi, Kokomi, Chiyo, Reita, Aren and Mikoto. He always takes care of them when they are in trouble and vice versa. He trusts them enough to nearly tell them about his psychic powers but ultimately did not, just so he will not burden them with a big secret.

For pastime, he is a bookworm, owning several books in his room and is frequently in his school's library. He enjoys watching television, including anime, due to electronics (unless he uses his psychometry) being mostly unaffected by his powers. While not being able to set foot in a movie theater without getting a spoiler, he also enjoys watching movies.

History
Past= Kusuo was born on August 16th by completely normal parents, housewife Saiki Kurumi and manga editor Saiki Kuniharu. He was raised by them along with his older brother, Saiki Kusuke.

During his mother's pregnancy, Kusuo was using his transformation ability which can be seen in the CT scans. When he was born in the hospital, he came out as a girl but an hour later he became a boy. At the age of 1 year old, Kusuo was able to fly, teleport and use telepathy to communicate with his parents. Kusuo was then pursued by an Intelligence Agency of a certain nation for his powers when he was 4. Since then Kusuo conceal his powers to avoid unnecessary trouble and erased the Intelligence Agency along with the nation.

When he was 6 years old, he slowly started to befriended Akechi Touma, an observant boy who criticizes one of their classmates. They first met in their elementary school's entrance ceremony, Touma wets himself due to nervousness, and Kusuo took him to the restroom. They ended up in the same class and sitting next to each other. One day, after school, Kusuo was about to teleport behind a bush, due to wanting to see a certain television show, and he witnesses his classmates bully Touma. Thinking Touma has passed out, Kusuo healed him by touching the tip of his shoe to Touma's arm.

Prior to current Kusuo travelling back in time, Touma quickly wakes up and asks young Kusuo if he just healed him and if he is a psychic. Kusuo uses his "playing dumb face" while several other kids were around. The other kids leave but Touma sticks around, still amazed at what he has done. Kusuo takes a liking to him; Touma asks him to show him more and thus he tells Touma about his powers. After some events, Touma ends up telling the class he is a psychic and Kusuo ended up destroying the classroom. Kusuo then swore to himself to never reveal his powers to anyone after that.

After current Kusuo traveled back in time, he influenced the event and everything changed. Young Kusuo leaves before Touma wakes up and unknowingly dropped his name tag. The next day, in PE class, Touma was bullied in front of his classmates. Right before he was about to be hit again, Kusuo uses his powers to their classmate on the pull up bar. At that moment Touma loudly exclaimed that Kusuo is a psychic but Kusuo doesn't say a word about it.

A year after the pull up bar incident, Touma still talks to Kusuo. Kusuo always saw how their classmates bully Touma, like taking his shoes and writing mean things about him in the chalkboard. Then one day, Kusuo was walking home when he suddenly heard Touma was in trouble. He runs back to the school and finds that Touma has been knocked out by his classmates and is been made fun of. Kusuo snaps and destroyed the classroom. The next scene shows the destruction of the classroom and the bodies of injured children on the ground with Kusuo standing with a stolid face. He erases their memories of him arriving to the scene and made Touma forget about the pull up bar event. Kusuo soon transfers away, afraid that their memories will come back if he stays.

Sometime closely afterwards, Kusuo started wearing his green-tinted glasses, that he found in his toy box, to block his petrification ability. They are shown when he visited his maternal grandparents. He got along well with his grandparents in the trip, but did not tell them about his powers.

When he was 11 years old, he started using his control devices that he and mostly Kusuke invented. They, along with their parents, initially thought it would completely remove his powers. However, the devices instead weaken his powers, to the point of removing his petrification ability for a period of time. Kusuo quickly figured out that his left device limits his powers but did not understand what his right one did. He soon finds out Kusuke put it as a self destruct switch, which, upon removed, his powers were to be revealed to the whole world. Kusuke made it a competition between the two, where he would try to remove it over the years and Kusuo beating him every time. Eventually, about a year later, Kusuke leaves to England and Kusuo does not see him for several years.

Kusuo and his family lived in a different area in Japan up until he was in middle school. Around his first year of high school, his family moved to Hidariwakibara Town after buying a house from Kusuke and due to an accident with his powers. Thus, at 15 years old, Kusuo transfers into PK Academy.

His abilities kept on increasing, which Kusuo thinks they are nothing but trouble. Kusuo had been keeping his distance from his classmates but Riki, known as their delinquent, was bullying him. Riki only became friendly with Kusuo when he implicitly helped Riki from being framed by Takahashi as the class' wallet thief. After the two got friendly, Shun went to befriend Kusuo who then rejected the later's quest on finding the mysterious alien (which turns out to be Kusuo). After learning the reason why Shun insists on becoming his friend, Kusuo finally gave up and transformed into the alien that Shun was looking for. The three started to hangout since then.

In Kusuo's 2nd year in PK Academy, he ends up in the same class again as Riki and Shun. There he also meets his other classmates like Kineshi, Aren, Kokomi, Chiyo, Reita and Mikoto, who kept on bugging him and somehow changed his perspective on being alone. He later thought of himself as a friend of theirs, to the point of even calling Shun his friend.
 * -|Current=

When Touma transfers to PK, he became nosy about Kusuo's circumstances as he still suspects Kusuo as a psychic. When Touma confronted Kusuo about the incident at their old grade school, Kusuo was hesitant so he petrified Touma. He decides to try on changing the course of the story by going back to the past on the day before Kusuo rampaged on the grade school. He then went back to the current time he was originally in, defeated, and the petrification does undone on Touma. He then decided to again tell Touma about his powers.

These are the alternate worlds that was introduced in the series. Censored World -Kusuo didn't enroll in PK Academy and then was thus unable to mingle and talk to the other students/characters. He then turned the world into a censored world in just 10 chapters. Instead, the other work of the author, the Mikami Case Files was serialized. Modified 2014 World -Kusuo influenced the meeting of his parents encounter which changed the flow of the events. Kusuke created a time machine which was the cause for the World War 3 to break out and the world met it's destruction. The cause of Kusuo's death was unclear but in Modified 2014 World, he has been dead for more than 3 years. Unable To Save The Dog World -In Chapter 1 or Episode 1, in another world "Kusuo" wasn't able to save the dog from the incoming truck. Devastated by the accident and his hesitant attitude, "Kusuo" decided to change for the better and used his psychic powers as people came to ask for his help.
 * -|Alternate Worlds=