Dabi ultimately stems from his parents' neglect and abuse. After the Final War, does Dabi feel any remorse as the family reunites?
Like his father's Hellflame, Dabi's Blueflame comes from within the body but has a higher temperature output than Endeavor.
Dabi was always going to be central to the Final War Saga of My Hero Academia ... Shigaraki is going to fight and destroy countless Heroes, and even solidify himself further as a villain.