There's probably been a lot of discussion about this. but my opinion is you shouldn't have to have a special chakra nature or anything like that to get and use sage mode neither should you become a stone. like naruto i think you should be able to learn the nature release for sage mode
In counter to this, a special chakra nature would be--and is going to be--both rare and special to those that discover they have it. Remember, most people won't even know they have it for a little while, leading to a feeling of both awe and horror at the discovery of such a thing. As for sage mode, I'm not sure why people keep asking for it, and it seems like it would be a bit dull. If you were to get something like it implemented into the game, why would you reduce all risk for gaining it? As for nature release....I say "meh" to it -- as I really don't think it's needed now or in the far future, but it probably wouldn't be that bad provided it was seriously toned down.
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