Oden was born in the Flower Capital of Wano Country to the shogun Kozuki Sukiyaki 59 years before the present day, and he began committing outrageous acts as soon as infancy.
When he was less than a year old, he threw his wet nurse across the room.
When he was 2, he caught two rabbits with his bare hands, and at age 4, he killed a bear by throwing a large boulder at it.
Starting at age 6, he started roaming the Red-Light District and participating in casinos, and by the time he was 8, he started drinking booze and began picking fights with gamblers. At age 9, even the yakuza had banned him from their casino. This resulted in Oden setting their casino on fire and starting a conflict with them, culminating in his capture a year later after he almost killed someone.
As punishment, Oden was sentenced to hard labor in the quarries, and he worked well enough there to gain significant prestige. He became the leader of the workers because of his leadership ability, charisma, skills and strenght.
When he was 14, he attempted to help the Flower Capital citizens during a great drought by diverting a river to the city. However, this resulted in the Capital becoming flooded, and the authorities attempted to capture Oden again.
To escape, Oden set out to sea for the very first time, but was quickly forced to return to land.
When he was 15 and still in hiding, he started working at a mountain temple, where he formed a harem of women whom he kidnapped from the Capital at night. The women’s loved ones as well as many powerful samurai went after Oden to stop him, but Oden stood his ground, resulting in the massive Harem Revolt.
For the next three years, Oden attempted to set out to sea 38 times. He quickly failed every time, though he managed to survive.
At age 18, Oden saw that a Mountain God was attacking the Flower Capital, and overheard Kin’emon and Denjiro talking about the Mountain God’s offspring being in their possession. Oden then told them to give him the giant boar’s offspring.
Oden was exiled from the Flower Capital after getting into a constant stream of violent fights.
He went to Kuri, which was Wano’s most lawless region. He confronted Kuri’s most dangerous criminal Ashura Doji and defeated him, and rounded up the other criminals to bring peace to Kuri.
Oden was then granted the title of daimyo of Kuri at the age of 20 after Sukiyaki heard about his deeds.
Oden married Kozuki Toki, and they had a son named Momonosuke followed by a daughter named Hiyori.
However, he felt too cramped in Wano, and he, Inuarashi, and Nekomamushi left the country illegally and set sail with the Whitebeard Pirates in which he became one of the Division Commanders.
Oden later sailed with the Roger Pirates, and went with them to Laugh Tale.
Over 20 years before the present, Oden left Roger’s crew and returned to Wano Country, despite the country’s rules on leaving and returning to its borders. Around that time, he was executed in the Flower Capital by Kaido and Kurozumi Orochi for refusing to divulge information of Laugh Tale. Anyway he was able to permanently scar the near-invulnerable Kaido, something no one else has been able to before and after.
Oden’s deeds in life were very similar to the feats of Hercules. At a young age he was incredibly strong, he diverted a river into the city, which is a take on one of Hercules’ 12 trials, and now this massive boar.
Oden killed two rabbits as a baby –> Hercules strangled two snakes as a baby
Oden crushed a bear –> Hercules killed the Nemean Lion
Diverting a river to relieve a drought (Oden) –> Diverting a river to wash out stables (Hercules)
Oden formed a harem –> Hercules slept with 50 daughters of Thespius