Saiki Kusuo

Saiki Kusuo (斉木 楠雄) is the protagonist of the series who has all-kinds ESP-related abilities. He usually avoids getting into troublesome situations. His trademark are his 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 progress he eventually gets along with his schoolmates especially Riki and Shun.

Background
Saiki has an extremely uncaring personality. As a gifted psychic that can do anything he wants, he has long stopped caring about the world; however, he has shown to be extremely cautious, as he often runs from Nendou, the only person he fears, and is prone to immediately teleporting to far away places upon spotting an insect. Saiki has a sweet tooth, so he loves sweets, especially Coffee Jelly. Fourteen days after his birth, Kusuo uttered his first word without moving his mouth and 1 month after birth he took his first step in midair. At the age of 1 was the first time Kusuo has voluntarily used his abilities, when his mother said they were out of mirin, Kusuo teleported away and returned with several bottles of mirin. Saiki has stated that in three days, he can wipe out humanity. The full extent of all of his abilities is unknown.

Apport
Apport - The power to pull something from somewhere else and have it appear before you.

Astral Projection
The power to separate his/someone else spirit from their body.
 * Possession - Kusuo taking over someone else's body by switching his spirit with theirs.

Clairvoyance
Without having to move, this power allows you to view objects faraway unobstructed.

Hypnosis
Hypnosis - Kusuo uses this power to disguise other people. Making Reita look like Kokomi, or making his father look like himself.

Invisibility
The power to turn himself invisible for 10 minutes. It cancels if someone touches him while he's invisible. When the time runs, or if someone touches him, he has to wait 1 minute before turning invisible again.

Levitation
The power to fly/float.

Medusa Vision
The power to turn someone to stone by looking them in the eye. This happens automatically unless he's wearing glasses.

Mind Control
The power to influence the minds of everyone on the planet- this can even change the laws of nature itself.

Precognition
The power to see events that will occur before they actually happen, usually accompanied by a headache.

Psychometry
The ability to know information about an object if he touches it.

Pyrokinesis
The ability allowing a person to create and control fire with the mind.

Restoration
The power to revert a person or object, and everything it touches, by 24 hours.

Shrinking Power/Size Augmentation
The power to shrink down his body to small sizes. It takes 1 hour to return to normal size. Later it's revealed that he also has the power to grow huge, but it's basically useless. Shrinking = fast, growing = slow.

Super strength
The ability of having extreme strength by humans, beyond what is believed to be normal.

Telekinesis
The ability to bring forth a physical energy just by thinking it, which you can use to do things like move or break objects.

Telepathy
The power to read and talk through minds. It works on humans and animals, but Kusuo can't turn it off.
 * A foreboding - The ability to telepathy to plant an idea/sense of foreboding in someone's head.

Teleportation
The power to send back an on object or yourself to a faraway place.
 * Transaction of Apport and Teleport: Anything teleported need to be exchanged using Apport with something of about equal value

Thoughtography
The ability to recreate picture perfect photos just by thinking it.

Time Travel/Time Leaps
The power to escape the flow of time by jumping to either the past or future. The power to go back in time- it also activates itself randomly, getting Kusuo stuck in a loop, and the only way to get time to go back to normal is for him to completely empty his mind of all thoughts) and then there's these one time powers (they were shown once very quickly but weren't really explained)

Transformation
The ability to physically transform his body into anything- takes 2 hours to fully transform, when he takes non-human form it's hard for him to control his strength.

X-Ray
The power to see through things you normally couldn't like underside of a face-down card, or the contents of an airtight box.

Other Powers

 * Kusuo made a giant ball of energy and destroyed an island once.
 * Kusuo can cancel karaoke songs with a beam from his eyes
 * The Psychobit power that Kusuo uses in JStars (he uses it once in the comic too).

Yumehara Chiyo
Chiyo fell in love with Kusuo for no reason. She is shown to see him in different way and started to do tricks to get his attention. However, Kusuo easily dodges her shenanigans and so she moved on to someone else. Chiyo once again started to think of Kusuo when she had been feeling bad about his boyfriend who have bad habits. Kusuo tried to get them back together but fails at the end.

Teruhashi Kokomi
Kokomi started noticing Kusuo when she met him once in the town. She thinks that if she talks to him, his summer might get better however Kusuo completely ignored her. With her constant chasing, she realized that may have fell in love to Kusuo. Kokomi is shown to be persistent on Kusuo that she'd go that far as to eat some gross ramen with Saiki something that he likes about her. Her luck is good too, like when she runs over Kusuo with his parents and Kusuo's friends which lead her to spend sometime at their house. At dinner, she went into conclusion that Kusuo might have bad experiences with girls. Kokomi once brought chocolates for Kusuo and wasn't able to give it him because she’s afraid he’ll get beaten up if she gives it to him so she throw it away but Kusuo grabs it anyway. She also caused haywire when she removed Kusuo's limited once when they were on a school outreach and when they got stranded on an island.

Nendou Riki
Riki is the person who's mind Kusuo cannot read. It was explained that it was because he's an idiot and he doesn't think. Riki often asks Kusuo to eat ramen and calls him partner much to Kusuo's dismay (even Nendou's father call him partner).

Kaidou Shun
Shun is a chuunibyou who went on great lengths just to befriend Kusuo. He went on Kusuo's neighbor just to find the alien on his drawing which was actually Kusuo. In the end, Kusuo had no other choice but to show up with the face of the person in his drawing. Shun then started following him around, much to his annoyance.

Hairo Kineshi
Hairo as Kusuo describe is a hot-blooded boy who is reliable and gets along well with everyone even towards the outcasts like Kusuo and his circle of friends.

Rifuta Imu
Imu was a lower classmen who was used by Kusuo in order to make Kokomi leave him by making it look like they were dating. However, when he tried to go along with it, it backfired and Imu started liking him for real. She later realized that it was Kokomi that she likes.

Aiura Mikoto
Mikoto was a Sooth Sayer, one of those who few who knew about Kusuo's power as an Esper. After learning and witnessing his powers, she started stalking him and to get close to him. She is a member of Occult Club with Saiki, Chiyo, Reita and Arisu.

Toritsuka Reita
Reita is a Spirit Medium, one of those who few who knew about Kusuo's power as an Esper. He learned about Kusuo's power over a spirit who saw him use his ability. Reita is the reason why Kusuo developed the power to see ghost. Kusuo ranks Reita as his number one hated guy and usually teases him like when they were dividing pairs for the test of courage and Reita wanted to be paired up with a Arisu but he paired Reita to Chiyo.

Trivia

 * His name means Psychic.
 * He is scared of bugs and Nendou because he can't read their minds.