With High School DxD ’s anime future currently uncertain (Season 4 ended with Hero ), it’s hard to say. The anime has a history of changing plot points. However, if a Season 5 is ever greenlit, it would cover volumes 11-12, and Season 6 would introduce Missouri.
While most characters in DxD rely on Sacred Gears, Demonic Powers, or Holy Swords, Missouri utilizes something far rarer: highschool dxd missouri