Element

'Elements' is one of the main character development mechaniques. There is five basic elements (also called nature manipulation) in the Naruto Universe:

Earth, Fire, Lightning, Water and Wind

There are also combinations of those basic elements and the sixth element Ying&Yang, but those won't be included into the games as elements but kekkei genkai(if at all).

Most ninjutsus will be based on one element. Learning and performing those may then require a certain level of control of the element. Every character will develope one to three (the exact number hasen't decided yet) element affinities.

Element Affinity
At a certain stage of the game the player character will be able to develope one, and maybe later more, element affinity. That will allow him to learn high level jutsu of that element which can't be performed by people with other affinities.

Implementation
None

Forum Links
http://forums.naruto-abunai.com/viewtopic.php?f=29&t=24