Professor Kukui is the regional Pokémon professor of the Generation VII games, Sun and Moon and Ultra Sun and Ultra Moon, situated in the Alola region. He studies Pokémon moves and he is married to Professor Burnet.
He was voiced by Keiichi Nakagawa in the Japanese version, and by Abe Goldfarb in the anime series, and Alejandro Sabb in the video game series in the English version.
Professor Kukui is a young man with a muscular physique, who has dark eyes, black hair, a black man bun and a goatee. He wears a white hat with a rainbow decoration in the front. Professor Kukui also wears glasses with a teal frame, a white lab coat with rolled-up sleeves, gray baggy pants with a teal stripe and white drawstrings and some teal shoes with a white outline. Professor Kukui has a silver ring on his ring finger. Later, he wears a Z-Ring on his left arm.
As Masked Royal, Professor Kukui wears a wrestling outfit: black wrestling tights with a white trim which has three Poké Ball designs on each sides and white knee-high wrestling boots. He also wears a brown elbowband on his right elbow and two matching black wristbands with a white trim on his wrists. To complete the outfit, he wears a red flame designed wrestling mask with green and light blue coloring with blue designs at the back of his mask.
Most of the time, Kukui is a helpful and friendly person. He likes to call the player character as "cousin". He often helps them throughout their adventure; however, he seems to be silly or out of his mind sometimes, such as when he takes attacks from a Rockruff in the beginning of the game. He has a "secret" identity where he is known as the "Masked Royal," a pro wrestler. However, when confronted, he always tries to deny it.
Professor Kukui is the teacher of the Pokémon School. He welcomes new students and has certain expectations from them, especially Ash. However, he also lets them help each other, if the situation calls for. His personality is cheerful, friendly and welcoming, but if it comes to doings - he is completely serious and calm. Often adds the names of moves to conversations, which reminds Samson Oak, who uses Pokémon-related puns. As a disguised Masked Royal, and like Professor Sycamore, Kukui is an adept battler as he demonstrated his battling skills against three Trainers in a handicap as well as Ash and his friends with the use of his Incineroar, much like how Sycamore battles using his Garchomp. Due to his secret double-life as both a teacher and a Pokemon Royal battler, Kukui sometimes strains his relationships with his students, friends and wife, Burnet. However, when it comes to critical situations against some powerful opponents outside his Masked Royal identity, Kukui has no choice but to reveal his battling prowess and makes them promise to hide his secret.
- Incineroar/Primarina/Decidueye (depends on the player's starter)
- Alolan Ninetales
- Midday Lycanroc
- Rockruff → Lycanroc (Midday Form)
- Munchlax → Snorlax
- He is named after "kukui", which is also called "Aleurites moluccana" that is the national tree of Hawaii.
- Professor Kukui is the first character who is neither a rival nor a player character as an NPC whose team can change depending on the starter Pokémon chosen by the player.
- Professor Kukui is the only NPC in Pokémon Sun, Moon, Ultra Sun, and Ultra Moon seen performing a Z-Move pose during battle. He performs the Normal-type pose during the Z-Move tutorial.