Instead of having a Bijuu system where one person controls the bijuu and is completely over-powered, I believe it would be better if each village had their own Bijuu in a dungeon where other villages could raid. By attacking another villages Bijuu, the attackers Bijuu would get stronger while the Bijuu being attacked would get weaker. A strong Bijuu could have benefits, such as an XP boost for the village. Each village's Bijuu would be EXTREMELY over powered, requiring villages to attack in groups to damage it. I believe that a system like this would encourage a village to work together, giving the Kage and high-ranked ninja the ability to plan attacks. Also, it offers a major PvM element for those who don't like PvP. For example: 5 Sound ninjas attack Leaf's bijuu, who has a current level of 5000. After doing some damage, the Sound ninjas get the Leaf Bijuu down to level 4996, in turn making the Sound Bijuu level 5004. If the default level for each Bijuu was 5000, Sound's Bijuu would be a +4, which would make every Sound Villager have an XP boost since it's Bijuu has a positive rating. Just a suggestion loosely based off a naruto browser game I used to play. Rate/Hate/Masturbate