Mr. Strong

Mr. Strong, known as Mr. Gongenzaka in the Japanese version, is a character in the ''Yu-Gi-Oh! ARC-V'' anime. He is Gong's father, and owns Strong Dojo.

Personality
Mr. Strong is a firm believer of the "Heavystrong Duel" style, as such he is shown to have be rather narrow-minded and dislikes changes. He assumed that Gong had stolen techniques from another school when he Synchro Summoned and considered it a disgrace big enough to want to disqualify Gong from the Duel. Despite that, he can be convinced to change his mind if he's impressed, as he accepted Gong's use of Synchro while staying loyal to the Heavystrong style.

He's shown to be proud of Gong and considers him a worthy inheritor of the Dojo. As a teacher, he appears to be rather strict and tough, as shown when Gong was challenged by him to a "serious match" and the next day had his face covered with band aids.[2]

Pre-Arc League Championship
Nico Smiley arranged a Duel with Mr. Strong between Yuya and Gong.[1] He was shocked when Gong Synchro Summoned "Superheavy Samurai Warlord Susanowo". He disapproved Gong's use of Synchro Summon and tried to declare the Duel as a loss for him. Gong defended himself by stating that even the Heavystrong Duel must evolve; otherwise it would be forgotten like an era. Mr. Strong was still reluctant, but allowed the Duel to continue. After watching Gong use Synchro while still keeping to his Heavystrong style, he accepted Gong's decision and congratulated both him and Yuya after the Duel ended.[3]

Arc League Championship
Before Gong's Duel against Grizzlepike Jones, Mr. Strong approved Gong's vow to take down Grizzlepike and gave him a new sash, which was a tradition of the dojo. When Gong was agonizing over Yuya's safety, Mr. Strong encouraged him to believe in Yuya and in himself, as now was the time for a Heavystrong spirit.[4]

Friendship Cup
After Gong was selected as one of the Lancers, Mr. Strong challenged him to a "serious match" to test his resolve, which apparently left Gong with several injuries.[5][2]