One thing I love about the devils in Chainsaw man part 2 is how creative they've gotten. Everything with the Falling devil and now with the Fire Devil.
It's such a clever misdirect cause not only is about how the chainsaw man church spread but also passion and desire. Fire spreads astonishingly a fast just like how the CSM Church spread to Canada and China and most of Japan. It's also the desire and passion to fight for chainsaw man, although this has twisted into the absolute maximum. As the numbers grow, the battle is only gonna get more intense. And its spreading given the amount of fuel (contracts).
It's so much more than physical fire.
Also, theory for the handful of people who read Fire Punch.
Seigi Akoku, one of the named members of the Devil Hunting club at school and one of the students trapped in the aquarium, is my top pick for the fire devil. Seigi means "righteousness" or "justice", with the justice devil being revealed in 146 to be the fire devil not only that, Yuko said that the Justice Devil was at their school and Yuko also burned her neighbor during Chapter 106: Bonfire.
This is beyond a stretch but Agni (Fire Punch) and Seigi look very similar (even missing the same right eye). This also wouldn't be the first time Fujimoto put a reference from another of his works in (I.E. Nayuta coming from Yogen no Nayuta)
