Daimon, being a large boy, took advantage of his large physique to began learning on Judo, a mainly close-contact style, based on throws mostly. Building up his body and even creating his own moves, Daimon quickly rose to be the surprise in the Judo world. He became the Japanese champion in no time, and shortly after, conquered the world champion. After several winning streaks, Daimon retired and hid in seclusion in the mountains of Japan, seeking some more moves, since he felt restricted to the Judo world, and liked to prove himself against other fighters of other styles. His chance came soon enough with the national martial arts tournament to decide the three fighters that would represent Japan in the new King of Fighters tournament. Daimon entered, hoping to come out on top and show the power of Judo to all!

Daimon had no real trouble advancing to the semfinals of the tournament, using his imponent physique to plow throught the other fighters, who couldn't stop this walking mountain of power, and were defeated by one of Daimon's earth- trembling moves. His opponent in the semifinals was, suprisingly, a young man named Kyo Kusanagi. Daimon had been friends with Kyo's father, Saisyu, and only knew Kyo when he was a little boy. Now he had grown, and become very strong. Daimon got excited on testing Saisyu's son's skills, and both climbed up to the arena.

Daimon soon found out how strong Kyo really was when he felt how powerful Kyo's blows where, scorching Daimon everytime he wanted to grab him. It was a very close fight after all, but Kyo was the winner of the match. Daimon was happy for Kyo, though, since he had become stronger than he thought. Daimon and Kyo shaked hands, but Kyo whispers to Daimon that he should better win in the losers match to make a team with him and Benimaru (the other finalist). Daimon smiles and promises. And having said that, Daimon used his entire strength to win his next match and become the third member of the Japan Team.

The rest is history. Daimon has been like the experienced side of the Hero Team, and often gives advice to the young Kyo and Benimaru, and also being so serene, he tends to be the windbreaker between Kyo and Benimaru's constant quarrels. After every tournament, Daimon takes his time to win the next Judo tournament as a warm-up for the next King of Fighters tournament. He has no personal interest to surpass Kyo as Benimaru does, only to show the power of Judo to the world! However, it is also very often for Kyo and Benimaru to help Daimon around women, since he seems to be pretty bad at it! (and he really wants to get married)

Daimon is also like a parental figure to Kyo, since Saisyu is out travelling most of the time, and advices him during hard times. He doesn't talk too much, but his confident smile and friendly grunt often proves to be more than enough. After the last tournament, Daimon decides to lead the Japan Judo team towards the world championship, and finally lead a life of peace and happiness up in the mountains.

After so many years of retirement from the King of Fighters tournament, Daimon has actually established himself, and even make up a family. With his little son, Daimon resumes his training in his own Judo dojo. He has no worries, and lives peacefully, but he knows something is amiss. After so many years of not seeing Kyo or Benimaru, Daimon wonders what happened to them after their separation following the battle of the Orochi. Soon enough, after a training session, Benimaru comes visit Daimon at his dojo! Daimon is overwhelmed with joy at the reunion, but Benimaru has better plans: they should reunite with Kyo and Shingo to resurrect the old Hero Team! Daimon doubts at first, but accepts with nostalgia and anxious to rejoin his friends for the rebirth of the Hero Team.

After reuniting with Kyo and Shingo, Daimon once again enters the King of Fighters arena, and his skills haven't seemed to deteriorate one bit. Even though he has not developed any sort of new moves, that ones he still has are sharped and tweaked to perfection. Daimon is still considered to be a huge fighting machine who likes to work out his opponents. Just like old times, Daimon helps Kyo and the others in their struggle to destroy the evil NESTS cartel, who have messed up Kyo's life for long enough. After the demise of NESTS, and barely escaping with their lives from the downed NESTS space station, Daimon and his son retreat back to their dojo in Japan. Daimon does not know if they will team up again next year, but one thing is for sure, and it's that Daimon sure had a lot of fun fighting like this once more! His heart burns with passion in anticipation for the next time they will fight together again....

Daimon always seems to have a very serious expression, and grunts a lot. However, he has a very warm heart, as he always takes his time to coexist with nature and encounter himself there. He also likes to teach youngsters about Judo in his free time. He also takes his time to serve as advicer and as a mediator between Kyo and Benimaru. However, Daimon really wants to get married someday, but the problem is, he is too nervous!