Never appeared in the manga, but he's real. Trust me

Name: Grand Kai, Dai Kaiō, "Grand Lord of the Worlds"
Origin: Dragon Ball
Gender: Male
Classification: Shin-jin, Grand Kai
Age: At least millions of years old
Powers and Abilities: Super strength, speed, durability, agility, endurance, skilled in martial arts, afterimage creation, flight, the ability to manipulate and use ki both defensively (can use his ki to enhance his natural durability and harden his skin) and offensively (can shoot ki blasts capable of crossing millions of kilometers and blowing up entire planets), telekinesis, matter manipulation, teleportation, telepathy, far-seeing arts
Weaknesses: None notable
Destructive Capacity: At least small planet level+ via powerscaling (is much stronger than the North and South Kais)
Range: Millions of kilometers
Speed: At least relativistic+ via powerscaling
Durability: At least small planet level+ via powerscaling
Lifting Strength: At least Class M+
Striking Strength: At least Class NJ+
Stamina: Should be very large
Standard Equipment: Nothing notable
Intelligence: Should be more knowledgeable than all of the "quadrant" Kais
Notable Attacks/Techniques:

Notable OBD Victories:

Notable OBD Losses:

Other: This profile is based on his stats if he was to appear in the manga