|Anime debut||Yu-Gi-Oh! SEVENS episode 0022: "The Man Who Possesses a Demon"|
|Japanese voice||Akio Otsuka|
Akinori Kamijo (
Gavan is more pale than his great-grandchildren and wears a monocle. He has lilac eyes and has blue hair as his great-grandchildren do, though his is a darker shade and neatly combed back save a small bang and extends into a beard and mustache. He dresses in expensive clothes; a knee-length dark brown coat with a light nougat lining and a yellow handkerchief in the pocket, a brown waistcoat, a white undershirt with a dark green tie, white gloves and black shoes.
Though viewed as dignified at first impressions, Gavan is generally enthusiastic and somewhat goofy. As with his great-grandchildren, he has a habit of emphasizing statements a particularly number of times; Gavan sometimes repeats statements three times. He is incredibly enthusiastic about gears and his profession, but seems oblivious as to the negative effects this has had on Luke. Yuga Ohdo's enthusiasm for gears prompts them to strike up a fast friendship.
Gavan's nickname comes from his first name, as 暁範 (Akinori) can be read as "Gyouban".
Gavan often played gear pitch guessing games with his great-grandson Luke. He Dueled Luke at one point and pretended to lose to make Luke happy, but Tiger noticed the cards in his hand and told him off, Luke tearfully admitting he wanted his great-grandfather to take him seriously. A year before the events of the series, Gavan gave Luke a wristwatch that caused technology to stop working around Luke, though Luke believes it to be the effects of a demon possessing him.
Goha 6 Siblings
Tiger brought Luke's friends Yuga Ohdo, Romin Kassidy, Gavin Sogetsu and Swirly to the Kallister family mansion to speak with Gavan over Luke's recent declaration of himself as the sixth of the Goha Siblings. Gavan enthusiastically greeted them, only to elbowed in the ribs by Tiger to get him back on track and he confirmed to them that Luke wasn't a Goha Sibling. Luke returned home for spare underwear while they were talking, prompting Tiger to hunt him down to Rush Duel him, and Swirly tried to get Gavan to talk them down, though Gavan was more distracted by Tiger reminding him of pantaloons. Swirly asked Gavan to advise Luke during the Duel after Luke revealed his reluctance to take over the Kallister Gear Company, and Gavan tried to convince Luke of the merits of gears, but only succeeded in reducing him to a whining mess. Tiger pushed Luke into a corner, but Luke was taken over by a draconian helmet and began calling himself "The☆Lukeman". He used "Fusion" to fuse two of his monsters together, and Gavan held onto Swirly's costume's tail to stop him being blown away by the shockwaves of the Fusion Summon. The☆Lukeman defeated Tiger and was drawn into the Goha Siblings' ship, Super Mobile Fortress Sixross, as it left, while Gavan rushed to his great-granddaughter's side in concern. Once Tiger had recovered, Gavan declared his use of "Fusion" meant there was no doubt he was a Kallister and revealed his thoughts of "Fusion" being akin to a set of gears moving together, though Tiger berated him to trying to brush the events off by saying something deep.
|Lucidien "Luke" Kallister||73||Lose|