Dokugiri isn't a real medical jutsu, just to tell you.
A 15 chakra attack could be sealing a soul to a corpse body to make an allie lol.
Also, fuin jutsu screw up your chakra so how about making the opponent unable to attack well.
We only have 2 doujutsu, 3 if the filler Ranmaru's doujutsu count though.
Fuin jutsu are perfectly legal, but most of the higher ones are considered Kinjutsu. We have seen Bijuu bonding jutsus so how about jutsu to unseal some kind of chakra or power inside of you to boost you up. It could be possible for Mokuton to be introduced and I have a few ideas of what some jutsus could do. Also, it would be funny if there was a skill to create a temporary wooden house that costs one chakra but because you shouldn't normally have mokuton and mokuton may be over powered, make it so because you had the genes implanted, you don't start with full HP every game day.