What is "Mito-ppo"? Mito's "three -ppoi" traits

Why are people from Mito sometimes described as argumentative, quick to anger, and stubborn? The answer lies in a centuries-old school of thought.
"Mito-ppo" is a term often used to describe the temperament of people from Mito, built around three core traits ending in the suffix "-ppoi."
It can sound like a harsh regional stereotype at first, but tracing its roots leads back to the scholarship and spirit cultivated by Mito Domain.
The three "-ppoi" traits
Argumentative, quick to anger, stubbornMito no san-ppoi
"Mito's three -ppoi" is said to combine being argumentative (rikutsu-ppoi), quick to anger (okori-ppoi), and stubborn (hone-ppoi). Some versions swap in 'quick to lose interest' (aki-ppoi) for one of the other two, so the exact combination varies a little by region and storyteller.
Roots in Mito Gaku scholarship
Mito Gaku and the argumentative streak
The 'argumentative' trait is said to trace back to the Mito Gaku school of thought, cultivated through Tokugawa Mitsukuni's compilation of the Dai Nihonshi. By the Bakumatsu era, Mito Gaku had become an influential strand of imperial-loyalist, anti-foreigner thought nationwide, and is credited as one of the driving forces behind the Meiji Restoration.
A harsh label with a kinder flip side
Reframing stubbornness and quick temper
'Stubborn' can also be read as an honest refusal to back down when something doesn't add up, and 'quick to anger' as evidence of a strong dislike for injustice. It's a blunt piece of regional self-description, but one that keeps the spirit of Mito Domain alive in everyday language.
Source:Ibaraki Prefecture: argumentative and quick to anger, but resolute and principled
FAQ
Does "Mito-ppo" only describe people from Mito City?
It's often used to describe the temperament of Ibaraki Prefecture as a whole, not strictly limited to Mito City residents, even though it takes its name from Mito Gaku.
What's the third trait in "the three -ppoi"?
The base version is argumentative, quick to anger, and stubborn, though some tellings swap in 'quick to lose interest' for one of the other two.