CodeSpectre

I recommend True Detective s1,s3

I find no flaws so far... Would like to see more world building and lore and I don't just mean Devils...More of the Abrahamic Faction and even beyond would be nice to see.. One major issue though is the use of 'Lord/Lady Sitri/Phenex/Gremory' etc for all members of a family/clan. Would be easier to keep track of if terms like Heir/Heiress or just Lady Rias/Sona or something similar is used

I've seen something similar in another fic....It was called Genjutsu: Subtitle or something similar....The target of the genjutsu pretty much sees subtitles(text) in his field of vision

Noblesse

No offense but this feels like it's been run through GPT at least once to enhance it. I would recommend not using gpt beyond grammatical correction since the writing feels too artificial.

Second Coming

Indra derived Ninjutsu from Hagoromo's Ninshu . Ninshu's purpose was harmony and understanding amongst people through chakra whereas Ninjutsu was designed purely for the purpose of battle