Okay, your system is OK, but can be a hell of a lot easier.
okay, the stat system only involved estimates, just guides the stats are not a definate. For example, having a lower stats doesnt mean you can't win, its still possible. these just put rough limits on what you can and can;t do character wise. so heres the stats:
Ninjutsu
This shows your ability to learn and use Ninjutsu techniques, how well you can utilize techniques and handseals
Taijutsu
This shows your ability to learn and use Taijutsu techniques, how well you can utilize techniques and agility
Genjutsu
This shows your ability to learn and use Genjutsu techniques, how well you can use techniques and getting out of them
Endurance
This shows your ability to endure, your stamina, how long you can last in a battle and how much damage your body can take
Chakra
This shows your ability to utilize chakra and chakra reserves, how well you can control your chakra and how much you can use
Speed
This shows your ability to move, how fast you can move your body, this doesnt just mean how fast you can run, it also means how fast you can move your limbs, this doesnt involved Agility
Strength
This shows your power physically, how strong your character is, this sin't just combat wise, it can also be for things such as puppetry - pulling the strings hard requires strength. Your character body build is also dependent upon thier strength
Intelligence
This shows your ability to analyse a situation, come up with solutions, problem solve, basically how smart your character is mentally
You gain so many Stat Point to share between the 8 stats dependant upon your character Rank.
Genin - 40 - Average of 5 In each Stat
Chuunin - 56 - Average of 7 In each Stat
Special Jounin - 64 - Average of 8 In each Stat
Jounin - 72 - Average of 9 In each Stat
Anbu - 80 - Average of 10 In each Stat
Sannin - 88 - Average of 11 In each Stat
Kage - 96 - Average of 12 In each Stat
The Max Stat would be 15, and below I give estimates on the level of each stat.
Ninjutsu3 - Can use E-Rank Techniques
5 - Can use D-Rank Techniques
7 - Can use C-Rank Techniques
9 - Can use B-Rank Techniques
11 - Can use A-Rank Techniques
13 - Can use S-Rank Techniques
Taijutsu3 - Can use E-Rank Techniques
5 - Can use D-Rank Techniques
7 - Can use C-Rank Techniques
9 - Can use B-Rank Techniques
11 - Can use A-Rank Techniques
13 - Can use S-Rank Techniques
Genjutsu3 - Can use E-Rank Techniques + Cannot Break from D-Rank+ Genjutsu
5 - Can use D-Rank Techniques + Cannot Break from C-Rank+ Genjutsu
7 - Can use C-Rank Techniques + Cannot Break from B-Rank+ Genjutsu
9 - Can use B-Rank Techniques + Cannot Break from A-Rank+ Genjutsu
11 - Can use A-Rank Techniques + Cannot Break from S-Rank Genjutsu
13 - Can use S-Rank Techniques + Can Break from S-Rank Genjutsu 50/50
Endurance3 - Can last 5 Posts of Fighting + Can only take a Few Hits
5 - Can last 8 Posts of Fighting + Can only take a Couple Hits
7 - Can last 11 Posts of Fighting + Can take Moderate Hits
9 - Can last 14 Posts of Fighting + Can take Multiple Hits
11 - Can last 17 Posts of Fighting + Can take Tens of Hits
13 - Can last 20 Posts of Fighting + Can take Hundreds of Hits
Chakra3 - Can use E-Rank Techniques + Can use around 5 Techniques per Fight
5 - Can use D-Rank Techniques + Can use around 10 Techniques per Fight
7 - Can use C-Rank Techniques + Can use around 15 Technique per Fight
9 - Can use B-Rank Techniques + Can use around 25 Techniques per Fight
11 - Can use A-Rank Techniques + Can use around 35 Techniques per Fight
13 - Can use S-Rank Techniques + Can use around 40 Techniques per Fight
Speed3 - Can move at 8 Mph
5 - Can move at 12 Mph
7 - Can move at 16 Mph
9 - Can move at 20 Mph
11 - Can move at 25 Mph
13 - Can move at 35 Mph
Strength3 - Can lift 15 Kg
5 - Can lift 20 Kg
7 - Can lift 30 Kg
9 - Can lift 40 Kg
11 - Can lift 50 Kg
13 - Can lift 60 Kg
Intelligence3 - Can solve an easy problem given time
5 - Can solve an easy problem quickly
7 - Can solve moderate problems given time
9 - Can solve moderate problems quickly
11 - Can solve advance problems given time
13 - Can solve advance problems quickly
To train stats it would require word-count training plus point training.
I'm unsure on what the points would be but Word-Count wise heres a guide.
Starting Stats - Stat Trained To = Word Count
1 - 2 = 300
2 - 3 = 500
3 - 4 = 700
4 - 5 = 900
5 - 6 = 1100
6 - 7 = 1300
7 - 8 = 1500
8 - 9 = 1800
9 - 10 = 2100
10 - 11 = 2400
11 - 12 = 2700
12 - 13 = 3000
13 - 14 = 3500
14 - 15 = 4000
When Ranking Up you will gain Stats along with the Rank, bumping your stats up to the next level. You get so many points to share over the 8 stats.
Genin - Chuunin = 16
Chuunin - Special Jounin = 8
Chuunin - Jounin = 16
Special Jounin - Jounin = 8
Special Jounin - Anbu = 16
Jounin - Anbu = 8
Jounin - Sannin = 16
Jounin - Kage = 24
Anbu - Sannin = 8
Anbu - Kage = 16
Sannin - Kage = 8
Any Qustions feel free to ask.