One idea could be an OC who is an exorcist with a special power to see the true forms of devils. They could start off as an enemy to the devils in the Highschool DxD world but then gradually form alliances due to a common threat. For example, a new, more powerful and evil force emerges that targets both exorcists and devils.
Another plot could involve an OC exorcist who is secretly half - devil. This character would struggle with their identity, trying to fit in with the exorcist community while also having an inner connection to the devil side. They could be on a mission to find a way to reconcile their two halves and bring peace between exorcists and devils.
Perhaps an OC exorcist who has the ability to steal the powers of devils they defeat. This would make them a target for both devils who want revenge and exorcists who are jealous of their power. The OC would have to navigate through the complex politics of both worlds while also trying to use their power for good.
The best chapter pointer here is Chapter 120, "Jiang Li Can Actually Do Acupuncture?!". It opens with Facing the sudden and somewhat strange request from Jiang Li, Director Sun... and closes on Drink this." Wen Jiaojiao looked at the half cup of thick substance:....
If you want the clearest chapter reference, go to Chapter 128. Early on, Still hungover, Huo Ziyang had just awakened from a blurry dream when his...; later, the chapter leans on He clicked his tongue in annoyance and picked up the phone..
The best chapter pointer here is Chapter 162, "Jiang - Boyfriend Power Explodes - Li". It opens with He Yun then realized what was happening and subconsciously wanted to check... and closes on Having heard the news, Director Sun personally came with staff to pick....
A practical answer is Chapter 125, because it turns the idea into a concrete scene. The chapter opens with Next, it was Qi Tianyu's turn., adds pressure through I was planning to plant roses in my field." Director Sun said, "There were..., and ends on He deliberately chose the most inconspicuous.
Chapter 111 is the strongest chapter-level answer because it starts from The main room's door was pushed open just a crack, and the head of the... and follows through on This time it was in a dream..
If you want the clearest chapter reference, go to Chapter 110. Early on, Jiang Li, carrying a wooden basin, walked over to the well.; later, the chapter leans on Uncle Zhao's house didn't have a water heater, so she could only make do....
If you want the clearest chapter reference, go to Chapter 114. Early on, As time passed, the number of viewers in the live broadcast gradually...; later, the chapter leans on After a whole day of trending searches yesterday, the popularity of....
Chapter 143 is the strongest chapter-level answer because it starts from Is there really such delicious fish soup in the world? and follows through on The live stream audience couldn't help but praise, "You can only see such....
The best chapter pointer here is Chapter 130, "Director Sun: He Got Schooled Again?". It opens with This task, the first one, should have been his in the bag. and closes on Normally, the best planting distance for sweet potato seedlings is 25 to....