Monson Maeda is the father of Fujio, Taison, and Youko, as well as the priest of Shourinji Temple.
According to Taison, he is "the strongest father in the world."
He has a body of steel that belies his age, with a grip strength of 90 kg, a punching power of 200 kg, and the ability to do 1,000 consecutive push-ups, including 60 with just his thumbs.

He is also very agile and has such endurance that he can run from Tokyo to Osaka in sandals.
He is also very robust, as he was able to leave the hospital just a few days after being hit by a truck.
The roundhouse kick, Taison's favorite technique, was taught to him directly by Monson, and he uses it himself as his favorite technique.
When he came to Tokyo, he literally swept away a thug who was picking a fight with him with a roundhouse kick.
His weakness is that he hates doctors.

Now in his fifties, his physical condition seems to have declined slightly, but Fujitake assures him that he will live to be 150.
In high school, he was the first leader of the Kyokuto High School gang and paved the way for the line of Kyokuto vigilante leaders. He is the elder statesman of Tatsuyoshi and the others.
His actions are so unreasonable that he cannot be considered a man of faith, but he is very strict when it comes to his own morals.

He kicked Fujio, who was swindling women, and laments that Kyokuto High School, where his younger brothers study, is dominated by an evil gang leader.

His name comes from former professional boxer Carlos Monzón.

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