Saiki Kusuo

Saiki Kusuo (斉木 楠雄) 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 is a gifted psychic. Having obtained his powers since birth, the first signs of Saiki's powers came from when he was able to hear the voices of his parents and he subsequently telepathically spoke back to them. Two months later, he demonstrated the ability to walk in the air. Saiki has stated that in three days, he can wipe out humanity. The full extent of all of his abilities is unknown.

Astral Projection
The power to separate your spirit (soul/consciousness) from your mind.

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.

Teleportation
The power to send back an on object or yourself to a faraway place.

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

Precognition
The power to see events that will occur before they actually happen.

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

Fulgurkinesis

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.

Size Manipulation
The power to freely change the size of one's body. However, it takes about 1 hour to return back to normal size.

Transformation
The power to freely change the body.

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.