Do I need to modify a few things about Hakushi?(MENTION SPOILERS)
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Okay, this may be long so I apologize if it gets lengthy.(also I will just say SPOILERS⚠️⚠️ just in case)
Alright first things first I want to make sure I have a definition correctly about something, with ocs I've heard that a 'Mary sue' is an oc with no flaws, very powerful, and basically just 'destroys everyone' correct?(again correct me if I'm wrong)
Now I have a demon OC named Hakushi, he is a demon and has these feats:
\- he is the original wielder of the pink pyrokenesis BDA and not Nezuko(she still gets the flames though and still turns to a demon, in my au the flames are called hellfire)
\- earned a reputation as the 'Black Demon' after he clashed with the water hashira(OC) Miku Ogawa(note that this was in the Meiji era so much earlier than Urokodaki even being water hashira) and crippled her with burns from his hellfire, nearly killed her but left her as he doesn't hunt humans(but the corps doesnt know of this) after Miku's encounter, the corps treats him as a kizuki level threat despite them not knowing for sure he is a kizuki(only assumed he was a former kizuki due to not having any ranking from Miku's testimony, even though he isn't connected to them)
\- he got his strength through cannibalism, he didn't just one day stop eating humans or just adapted to break demon flesh, his body took CENTURIES to get this up the point he is(and yes there were times where he gave in to his human cravings, but over time he "lost that urge" for humans)
\- over that course he also broke free from Muzan's curse(like Tamayo did)
\- he also consumes wisteria, he nearly died multiple times from ingesting them, over time he forced his body to build antibodies leading eventually him gaining immunity, like posion dart frogs he stored the poisons as a offensive advantage against demons(hence where the pink flames gives the negative effects to demons as shown in canon such as stunning regeneration, and burning off poison as well)
In short: Hakushi gained massive power at a cost nearly his life multiple times.
\- the reason why the corps have difficulty catching him is because he lives a migratory lifestyle, he doesn't claim and stay put in a territory. He is always on the move to where demons are more abundant.
\- Muzan does know of Hakushi's reputation very well(through his telepathic through demons memories, he often sees the last moments of the demons before Hakushi kills them, but he can't much of a good look at how Hakushicactually looks like) he has sent lower rank kizukis after him but Hakushi has killed and eaten them, due to how elusive Hakushi is, Muzan struggles to realize if he is in fact even real or just some myth.
\- he killed Douma in the infinity castle when Muzan had learned about his daughter Ryoka and sent out to abduct her, he was able to overpower Douma cryokenesis since Hakushi countered his ice cloud ability cause he manipulates his internal body heat unlike Douma whom relies on his fans to spread the ice cloud(Kanae was still killed by upper 2 but now a longsword OC of mine that's still a wip), but had died by Kokushibo and Akaza.
So, given Hakushi's abilities, are they alright? Or is there modifications that make Hakushi not 'break' canon or be a mary sue???
If you need me to elaborate more on lore or anything else, then please tell me so you can understand