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Sage mode is an art of mind, body, and soul that the master of each summon normal can perform. Sage mod uses a mix of the host's body and natural energy to form the perfect ninja. A sage's power and chakra use have the ability to duble if not triple in strength. Although this power in useful, it can total a body if not used right or over used.

-Rules-
-Only the head summoner has the right to a sage mode unless they teach this skill to another.
-Sage mode takes a full uninterrupted post to activate
-Sage mode can only be used if the user has a fully balanced scale of natural energy chakra and normal chakra. This means that the use of demons and other chakra raising methods will not work unless the user is A rank and up.
-Sage mode will drain a user of all there chakra after 3 uses of the mode. Each mode can last up to 5 posts.
-Sage mode gives the user inhuman strength and the the ability to duble or triple the power of normal jutsu.


The Curent sage's
~Toad Sage:
~Bird Sage: Kunesume2
~Snake Sage: Limit3d 3dition

Why only the head summoner? If the head summoner can learn it, then anyone who can summon that should be able to learn it (be taught by the summon, like Naruto was taught by the toads).

Because thats the way things will go in the guild. Everything that happens to Naruto doesn't always apply for every situation. To even throw him in the mix you would have to factor in the Number of known Toad Summoners in the Series was only 2. When Naruto Mastered it, Jiraya was dead. Being that he was the only other toad sage, he passed and someone else needed to take his place. Now, in a situation like that, it would make sense that the summoning would teach you. But, if a Sage is present, that becomes impossible.

My Akatsuki character is the Snake sage, can my Sannin leaf character be the toad sage? Or am I only allowed to have one Sage RPC?

If you are refering to Jin, which Idk if you are, He is in the akatsuki. Although as I said, idk if you are : P