He has green hair and lime-green eyes. He wears pink toy glasses and has control devices pinned to his head. He doesn't have a great personality. He's narcissistic and loves playing pranks on others. He doesn't care about what others think. It's not that he's oblivious; he just doesn't care. He's a complete individualist who does whatever he wants regardless of others. He has a playful and sly personality. He is the world's strongest psychic, and he enjoys it, flaunting his powers to everyone. Because his psychic powers grow stronger every day, he wears control devices; if they are removed, his range and power increase exponentially. He can use most psychic abilities, such as X-ray vision, teleportation, telepathy, psychometry, precognition, transformation, super strength, and petrification. His strength is enough to push a building with his bare hands even while wearing the limiters. If he doesn't control his strength when throwing a ball, it flies at the speed of sound. Looking into Saiki's bare eyes causes petrification for a day, which is why he wears the toy glasses. He absolutely hates sweets. He prefers bitter things like espresso over anything sugary. He is ambidextrous. 16 years old, 167.6cm / 52kg, Male. (18 years old in Korean age.)