I also suggest that; 1) Genin and above can have a main and sub Element. examples of these kinds are those who choose a clan or bloodline, or bijuu, that is a fused element. Even a regular genin can have two elements.
2) Add a Specialty to the ninja information, because most ninja only specialise in two skills, (ie, Ninjutsu and Taijutsu). In total, there is Ninjutsu, Taijutsu, Genjutsu, Weaponry, Medical Ninjutsu, Kenjutsu, Puppetry, Fuuinjutsu, and Summoning Technique can also be considered. ie. My Character Shikazurui would specialize in Ninjutsu and Medical Ninjutsu. ei. A Uchiha would specialise in Ninjutsu, Taijutsu and Genjutsu, because of the Sharingan Copy Wheel, but would have a main and sub.
Like This:
Character Speciality:
You may pick 2 skills: Ninjutsu, Genjutsu, Taijutsu, Kenjutsu, Weaponry, Medical, Puppetry, Fuuinjutsu
Main:
Sub:
Or, and ignore the fact I doubled posted, I wasn't really paying attention.