Born in the Lightening Country, Kaji was considered a bit of an odd case. Born from the Uzumaki clan, a clan renown for high levels of chakra, Kaji always seemed to have difficulty utilizing the gift he was born with. He was quickly becoming a disappointment to his clan, who prided themselves on producing strong and talented shinobi.
It all came to a head when Kaji was ten, kidnapped and dragged off by a group of Shinobi, interested in his high chakra, looking for ways to extract and utilize it.
It was during these long, painful years of experimentation that an ability within Kaji came to light. Kaji had the ability to transfer his chakra to anyone who bit him, regardless whether he wanted to or not. Once this was discovered, his captors used him as a sort of Chakra tank, draining him dry before throwing him in a cell to recover. They also attempted to experiment with this ability, to see if it did more than just heal, but with little success.
Kaji endured these horrific experiments for eight long years. Nobody seemed to be coming to save him, causing Kaji to believe his family had left him to rot, filling him with despair.
And thrn, everything went quiet. It took him a day, sitting alone in his cell, before he realized the cell door was unlocked. Outside were the bloody remains of his captors. Someone had gone through the entire facility and killed everyone! Kaji was the only one left alive.
Free for the first time in years, Kaji silently stumbled out into an unfamiliar world.
Proficiencies
Healing Bite [Journeyman]
While this ability is passive in nature, the more powerful Kaji becomes, the more potent and rapid this ability. An ability inherited from his father, whenever Kaji is bitten his chakra is transferred into the biter, healing them. At his current level Kaji can completely heal people from moderate wounds and moderate strength toxins for the cost of a third of his chakra. This ability can also temporarily stabilize critical wounds until proper medical treatment can be applied.
Unfortunately, this ability drains the same amount of chakra regardless of whether he's healing a small scrape or a massive laceration. Refusing to heal someone who is biting him requires a conscious effort to prevent the transfer of his chakra. This means if he is bitten while unconscious he will heal the biter.
Hey there, I like the concept you have for Kaji. Just need to tune things a bit. I like how you've added limits to it as far as number of uses, we just need to better define what the healing entails at this level. As a base we will look at examples from this thread for medical ninjutsu.
"[Medical Ninjutsu] Journeyman: Mystic Palm, Chakra Scalpel (non-combat: nintai required for offensive use). (Moderate wounds and temporary suppression of critical wounds)
Master: Intensive Care/Critical Injury healing"
Since the ability you have here is specialized to just do healing, I'm okay with it being on par if not slightly better at apprentice than a typical medical skill does at journeyman. I think it'd be too far to go with a specialized apprentice doing things that a master medic would do.
Wanderers though can actually start at journeyman rank if they only take one proficiency. I could see you bumping things up and making the bite heal moderate injuries as well as curing toxins at that level perhaps? Wouldn't work as a means to regenerate missing appendages. If you want to keep it at apprentice for plot reasons you could have it do the moderate healing/poison purifying at this rank with the numbered limits and then at journeyman you can increase the amount of times they can be bitten per day.