NovelDude
I like fighting novels like Wuxia and just generic Magic Academy stuff overall.
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Read books
Good point.
Yes
I’m not sure what your comment has to do with Sakura learning the Yin Seal.
You’ve learnt the proven path of doing maths, are you a mathematician now? Plus, the ‘Strength of a Hundred Seal’ required talent, not hard work. Tsunade would have taught it to Naruto or someone else if it was THAT easy to learn. It doesn’t matter who invented it. You can only master what you have the talent for. On top of all I just said, Tsunade did not invent the Yin Seal. It was passed down to her from ancient times (canon). Meaning the inventor existed hundreds of years ago.
He calls himself (self-proclaimed) Blue Beast in the Anime. I’m going with that.