I was thinking it would be cool if the recharge speed of your chakra gets slower when your health is low.

Name:Devil
Age: 17
Gender: Male
Height: 185cm (6ft)
Weight: 55kg
Hairstyle: kinda like kakashi's hairstyle
Facial hair: no facial hair
Hair color: Grey
Eye color: Crystal Blue
Blood type: 0
Primary chakra nature: Fire Release
Village: Kaminarigakure
Clan: Himitsu Clan
Good or evil at heart?:
 Depends on situtations he can act out his presonality.
Description of the character's personality:
 No one knows how he really feels or thinks.He is kinda like the quiet guy with secret powers.
 He can act out his personality so well depending on the situation so no one can use his personality
 againts him.
Description of the character's history:
 In the village of Kaminarigakure he was just a little boy who had nobody and sleeped on streets.
 He always liked fighting and trained everyday.His jutsu skills were getting badder because he couldnt
 control his chakra well but he was in chunin level of taijutsu.When he was 10 years old an anbu called
 Kishi saw him training and helped him with chackra controlling.When Devil was 17 years old his skills were
 close to an anbu.Kishi talked to the Kage about him and they recuited him to the Anbu.Meanwhile Kishi was
 sent to a mission to kill a rogue ninja but he got killed.The kage never told Devil the rogue ninja's name
 because Devil would become an avenger but one day Devil ran away from the village and turned back a month later
 with the rogue ninja's head in his hands.