what do you think of multiple mystery per ninja? i think it would be cool addition.. a system that is not yet implemented on other version (right?? i don't know ). I also think it will make strategizing (not real word) better. For example, sage naruto with fuuton: rasenshuriken + rasen tarrengan (not sure of the name).. or maybe give ninjas additional passive like frog kumite for sage naruto. I'm sure you can give each ninja at least 1 skill or passive (naruto wiki is just out there ).. maybe add a condition to the second mystery, say it can only be used once per battle or can be used when your life is less than 10% (something that could balanced it.. something that would make you say "OH WHAT A COMEBACK!!!"). It's just a suggestion nothing bad about it i think it will help you establish your identity from other versions.. it would make you unique.. like you don't have to follow the footsteps of other versions (i know you already said you won't necessarily follow them) instead make a function that would make other versions follow you. I mean it would be a good thing if players from other versions switch to this version (i don't know if it would make really a difference, like do tencent [chinese version of NO] and oasis [us version of NO] share money? )

Examples:

Sasuke - [mystery] chidori senbon/chidori nagaishi (this is already done, i remember this on ninja exam); [passive] sharingan (+evasion)

masked man- [mystery] kyuubi tailed beast bomb

nagato- [mystery] rinne tensei/gedo mazou(+ the dragon)

etc...