Naruto's Advantages:
-He is one of the long-liver in Naruto Arena,because of his Shadow Clone which can half the damage dealt to him!
-He can deal quite a decent damage with his Rasengan,and even stun the target for a round!
-His Uzumaki Naruto Rendan cost only 1 Taijutsu Chakra which deals 30 damage,uses one chakra lesser than Sasuke's Lion Combo which also deals 30 damage!
Naruto's Disadvantages:
-He can only attack and stun,and no other support roles.
-He must activate Shadow Clone in order to use any other attacks except for Replacement Technique,which means he is useless without it!
Sasuke's Advantages:
-Another long-liver,because of his Sharingan
-He can deal 60 damage now to an opponent with Chidori which makes him serve the role as a Heavy Solo Attacker.
-He also deal 30 damage to an opponent with Lion Combo which is quite a decent damage
Sasuke's Disadvantages:
-He can only attack,and not any support roles
Sakura's Advantages:
-Her Rampange is very useful for a number of things,and only uses 2 RANDOM CHAKRA!
-She could be another long-liver because of her Rampange(which is 5 ROUNDS,not just 4!
-She can hurt the enemy with 30 damage with Rampange activated,and regardless of Rampange activated or not,she could stun a single enemy for 1 round!Which is a bit useful when someone in your enemy team is doing something lethal to your team,which can slow your defeat down,and the best thing is,there is no cooldown at all!Oh,and it only cost 1 Taijutsu Chakra...Cheap cost!
-She can serves as a medic to heal her teammates,for only 1 Ninjutsu Chakra,and again,no cooldown at all!!!
Sakura's Disadvantage:
-She seem being useless without Rampange,because she can only deals 15 damage and not so long-lived.
-She cannot heal herself,but of course,if she can heal herself,she would already be almost unbeatable and it will make the game unbalance!
Haku's Advantages:
-When he activates the Demonic Ice Mirrors,he can be invulnerable for 3 rounds!
-He can deal 30 damage to an/ALL(only with Demonic Ice Mirrors)opponents,which is also quite a decent damage!
-He also could leave an/ALL(only with Demonic Ice Mirror)the enemies unconscious with his Acupuncture.
-He could be a good 1 on 1 fighter or even 1 on 3 fighter because he can be invulnerable for 3 rounds and can hurt all the enemies!And at the 3rd round,if he is lucky,he could leave his enemies unconscious for 2 rounds so he can use Demonic Ice Mirrors again after his enemies gain their consciousness!So the enemies would get fustrated for not being able to even hurt Haku a little

hehe...
Haku's Disadvantages:
-He cannot be a good 1 on 1 fighter if he do not have chakra luck as he needs Ninjutsu and Bloodline Chakra!If he is the only guy that is not killed,he can only get a chakra at every round,and his attacks(except Mirror Transfer) are costing 2 Chakra!And if he keep getting other Chakra,that is it.He will die surely!
Lee's Advantages:
-He can deal high damage of 120 with lotus(with the 5gates opened only)!You are lucky if your opponent is not using anything skills to protect against it like Sharingan,because it will only deal 60 damage then...but of course,you can still attack again...but my advice is,if you are lucky enough,once that effect wears off,use some other characters who can deal at least 40 damage finish that target off!
-He will be another long lived character if you use Drunken Fist Style Taijutsu because attacks on dealt on him is only 50 percent of the original damage...
-He can be invulnerable for 2 rounds when 5 gates are opened!
-He is losing his health by PERCENT,not AMOUNT,which is good because no matter what AMOUNT there is,because there is always a percentage no matter what number it is(but he will die if the percentage ends up less than 1),he would not die by opening his 5 gates!(Unless you got poisoned by Kankuro or something)
Lee's Disadvantages:
-Too bad if Gaara is your opponent(unless you have other attackers),because Gaara's Armour of Sand can remove the 75% of the original damage,so lotus(gates opened)will only 30 to him...Aw...And what is the worst is,Gaara will try to stun you,and if Gaara get even more lucky,he will get 2 Ninjutsu Chakra and use Dessert Funeral to finish you off!
-He is a Kamikaze fighter,which means when he open the 5 gates,he will lose 80 PERCENT of his health!Thats why after 2 rounds,he is the most likely to be the first one killed!
-He can only use Taijutsu Chakra,which if he has no Chakra luck,too bad!
Side advice:When you are opening you 5 gates,please check if Kankuro or Shizune are poisoning you,or maybe even Sakon USING PARASITE TECHNIQUE ON YOU!Also,characters like Zabuza and Kabuto can remove your defence.Another character that is dangerous to Lee is Ino,because if Ino uses Mind body Disturbation Technique on your Teammate,if the Teammate ATTACKS LEE,the END for YOU!!!So be careful,check carefully,I am sure you do not want to be dieing when you are going to finish at least one of your opponents,right?Rolling On Floor Laughing*
Tenten's Advantages:
-She can stun enemy team for 1 turn with Twin Rising Dragons Trap)
-She can deal 30 damage to all enemy with Twin Rising Dragons!(think of it,if there is 3 opponents,it means each chakra can cause 45 damage!)
Tenten's Disadvantages:
-She must activate Summoning Twin Rising Dragon in order to use other skills(except Replacement Technique),which waste 1 turn...
-Like Lee,she can only use Taijutsu Chakra for her attacks,which if she has no Chakra luck,too bad!
Neji's Advantages:
-He can use 8 Trigam Palms Heavenly Spin to deal 15 damage to all enemy and next turn be invulnerable,which makes him quite a good 1 on 1 fighter!
-He can deal 40 damage in total with Gentle Fist Taijutsu at a single person!
-He can be a Chakra Remover with his 8 Trigam 64 Palm Technique!
-Most important of all,he can depend either Taijutsu or Bloodline Chakra,which makes him more flexible!
Neji's Disadvantages:
-He can only REMOVE chakra,not LEECH!(This is only disadvantage when you want to LEECH,not just REMOVE! )
-He can only deal 15 damage,which is quite small amount to many of us(including me)
Gaara's Advantages:
-He could stun an enemy for 2 rounds!
-He could instant kill an enemy no matter how much defence he has(like sharingan or shadow clones)
-He is another Long-liver if he used Armour Of Sand!
Gaara's Disadvantages:
-He is a bit useless when it is 1 vs 1 fight because he need to wait for NINJUTSU(Blue)Chakra!Please read my side advice at the bottom of this paragraph!
-He depends just too much on Ninjutsu Chakra,if he does not have the Chakra luck,too bad!
*Side advice:If you are going through 1 vs 1 battle now,I suggest using armour of sand to defend yourself first(so that you can live 3 times as long)and save 3 Ninjutsu Chakra...Once you have them,then start using Dessert Coffin,then....DESERT FUNERAL!!!But the reason why I suggest saving 3 Ninjutsu Chakra first because you can only get 1 Chakra per round,and you would not be so lucky,because probrablity is 1/4 for each chakra to get,and getting another 2 Ninjutsu Chakra after using Dessert Coffin would be hard,because the chance is now 1/8!!!
Kiba's Advantages:
-He is a very good team damager because he can deal 60 damage to all opponents with Double Headed Wolf in 3 rounds!!!
-He can deal 60 damage to one opponent with Garouga when Double Headed Wolf is activated,which instantly kill one opponent(or 2 if u have 2 Taijutsu Chakra)since your opponent is already damaged by Double Headed Wolf!!!
-He is invulnerable for 3 rounds when using Double Headed Wolf!!!
-After the Balance Update 3,he can even heal 15 HP after 3 round using Double Headed Wolf!!!
-His Dynamic Air Marking cost 2 RANDOM CHAKRA,which is flexible and good!
Kiba's Disadvantage:
-He must use Dynamic Air Marking to activate any other attacks!
-Without Double Headed Wolf,Garouga can only deal 30(but still quite a decent damage to most of us)
(Still Under Construction)
Please give some more example or idea what to write next thought I have some more ideas,thank you!
I will be very busy this year because this year is important to me for studies,but I will try to find some time adding details,so do not worry!