Harie_Dharan

Have you read " Naruto : Our goal is to dig the corner of konoha " novel ???.. that has some similarities with this one ... it's about an op mc from iwa who sways people to join iwa when danzo tries to kill them like the uchiha..

Douluo Town Shidouluo

you should place his body in public hiding it with a timed genjutsu so that he would be found by everyone suddenly so that his deeds could not be covered up like usual ...

will the replication tech copy materials like gold, adamantium, vibranium etc ... if it could he can create wakanda and iron man techs ... if he could create with a pocket dimension he could store his fortress and techs there, it will be safer cause people like ancient one or asgard could take it ... you could have made him immune to divation and such

have the mc fight humans too for experience, not just soul beast cause fighting humans is different from fighting beasts... he could accidently kill someone if he did not know the power needed to defeat someone without killing them ... though if he could sense their power level and adjust it will not be a problem

the external bones that i know from other fanfics are wings , throat (sound ) , tails , armour , horns ( thunder ) , crown , eyes , mimic that can transform into anything by absorbing like rimuru , extra legs or arms or head etc

i liked the previous one better. this has more details and all but in trying to make the mc not too op you made too weak even with all his powers. i mean he is a mutant, a sorcerror and a wizard who actually is physically strong but still got caught by someone and took so long to escape.

good start .... this has great potential .... if you want strong enemies you could use the movies and fillers enemies as most other demons were sealed and you could make mc seal or kill them .... also the threat level during that era was great even for the mc .... seals have great possibilities like space expansion , mind protection , training , artifacts , communication , etc ... you could even make seals that restricts bloodlines , the reaction of the uchiha and hyuga if it is done would be precious

will he get other devil fruit powers like teach ... also has he collected other devil fruits during these years .... this story has some similarities to the story " Pirate of darkness " in the mtlnovel ... you could take some ideas from there if you could read through all the errors and confusion that is in that novel

can he use his energy in different ways like barriers , flight or even similar to chakra from naruto