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
TacetIrae
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LIKEHmm thanks for suggestions. I dont want To make a lot of Strong enemies from its home world. My idea For Enemies will be more broad as we know that otsusuki is space nation or clan , there shiuld be others as well as well at other dimensions whete other people lIve magbe other races. So with that idea i Will probably look at crossover with 2-3 movies /amines