Health ranking info copy and pasted form gamefaqs
Introduction
Anyone who has extensively played GNT2, GNT3, and even quite possibly GNT1 have come to realize that some characters just seem to take more or less damage than others, or they just seem to live longer or shorter. Whether or not this can be discerned as programmers giving characters more life or more defense is irrelevant, and the term used from now on in this post will be “defense/life”. The fact of the matter is, it’s not our imagination at all, some characters can just endure more attacks than others.
Purpose
To discover the defense/life of each character and pinpoint it to as close to their true values as possible.
Procedure
Mode: Training
Attack Level: 2 (Default)
Damage Dealer: Naruto’s A (single kunai)
Naruto and X character put into training mode. Naruto throws however many kunais necessary to deplete his opponents entire life bar. Results of how many kunais were needed to achieve this are recorded and compared.
Results
Results are displayed by percentages, with 100% being the assumed average. Since it is unknown what the average defense/life expectancy is, Neji, who alone took an even 30 kunais to defeat will be used as the 100% factor.
76.6% (23 kunais)
K. Naruto
90% (27 kunais)
Hinata
Ino
Tenten
Kankuro
Sakura
93.3% (28 kunais)
Shino
Haku
Temari
96.6% (29 kunais)
Sandaime
Shikamaru
Anko
Kiba
100% (30 kunais)
Neji
103.3% (31 kunais)
Sasuke (Normal and Sharingan)
Tsunade
106.6% (32 kunais)
Mizuki
Naruto
Gaara
Orochimaru
110% (33 kunais)
Kakashi (not possible to gauge S.Kakashi’s defense/life with this method due to life drain)
Gai
Itachi
Iruka
Zabuza
Chouji
Lee (without any gates open and with one gate open, not possible to guage Lee’s defense/life with this method when both gates are open due to life drain)
116.6% (35 kunais)
Jiraiya
Concluding/Interesting Notes
-K. Naruto alone undoubtedly has the least defense/life.
-Jiraiya alone undoubtedly has the most defense/life.
-Iruka has more defense/life than Mizuki.
-Results also concur to damage received by specials.
—Ura Renge kills K.Naruto instantly even if he were to have 100% life. Oddly enough, it takes off precisely 100% life.
—Ura Renge inflicts precisely 60% damage on Jiraiya.
—Since K.Naruto has 76.6% defense/life and Jiraiya has 116.6% defense/life (a precise 40% difference), these results further support the fact that damage is not affected between characters depending on whether the attack is taijutsu, ninjutsu, projectile, or special.
-Some variances still occurred. Example: Even though Lee and Kakashi took the same 33 kunais to kill, Lee would have SLIGHTLY less life left after the 32nd kunai than the others.