Summary
Blood Manipulation is one of the most powerful inherited cursed techniquesin the world ofJJK, and fans have seen it being utilized on many occasions in the story so far. This cursed technique belongs specifically to the members of the Kamo Clan, and through this clan, it has been inherited by some others as well.
So far, fans have seen quite a few users of blood manipulation in JJK, and most of them have gone on to do incredibly well for themselves and established themselves as key figures in the story.

4Yuji
Yuji Ate The Death Painting 4-9 To Gain Blood Manipulation
The latest user of blood manipulation inJJKis none other than Yuji. He was taught this skill by none other than Choso and Noritoshi,during the timeskip inJJK, specifically after he consumed Death Paintings 4-9. Yuji utilized the skill first of all in his battle against Sukuna. He was seen utilizing his blood to increase his healing output from reverse cursed technique. He could also use a very dangerous ability, known as Piercing Blood.
He grazed Sukuna across his faceand caused him a serious injury with this power, and, clearly, fans can tell that Yuji has the potential to become the strongest user of blood manipulation in the series. He is going to excel in this art greatly with time and that is certainly very exciting for the fans.

3Noritoshi Kamo
A Grade One Sorcerer
Noritoshi Kamo is the first user of blood manipulation that the fans saw in JJK. He utilized this technique first of all in his battle against Megumi,another individual from the Big Three families, just like himself. During this fight, the true potential of blood manipulation was shown to the fans. Noritoshi Kamo can utilize many incredible blood manipulation abilities. He can boost his body beyond human limitations using this power, as well as utilize advanced techniques such as Convergence. That said, his usage of blood manipulation is not as refined as some others.
It can be said that Flowing Red Scale is one of his strongest techniques, and using this ability, he can push his body beyond all its limits, increasing the rate at which the blood flows through it, as well as boosting all other operations going on inside of his body. He is also a user of Convergence, as mentioned above. Through convergence, he can utilize techniques such as Piercing Blood. In the coming years, he can become a true master of Blood Manipulation, and that goes without saying.

2Choso
A Master Of Blood Manipulation
Choso is a Death Paintingthat fans were introduced to quite early on in the series. Given that he is a half-cursed spirit and half-human, Choso works slightly differently than Noritoshi when it comes to blood manipulation. He can produce a tremendous amount of blood, since he has no lack of it. As such, by definition, his usage of blood manipulation is stronger than that of Kamo, and he is also a very advanced user of blood manipulation.
He can utilize all the techniques that Noritoshi Kamo can utilize and more. He can use techniques such as Convergence, and through it, utilize the power of Piercing Blood. He can also use other deadly abilities, such as Supernova, which can be considered to be a very special ability. Through the many battles that he has fought in the series, he has shown to be strong enough to beat enemies such as Naoya Zenin.
If that isn’t enough,he was even able to hold his own against Sukuna, and, using blood manipulation, he even crafted an armor around his body to dull the blows of the King of Curses. If nothing else, then Choso can be called one of the smartest users of blood manipulation, and he has also taught the skill to others, which signifies his mastery over this technique.
1Noritoshi Kamo (Ancestor)
The Most Heinous User Of Blood Manipulation
The ancestor of Noritoshi from Kyoto High, the original Noritoshi Kamomost likely also had access to Blood Manipulation. Although this isn’t explicitly stated in the series, what fans know for sure is that he was a member of the Kamo clan, and one of the most prominent figures at that. If that is the case, then that, by definition, makes him a candidate for the user of Blood Manipulation.
What essentially confirms that he had the skill was the fact that Choso mentioned that he mixed his blood with the Death Paintings and that resulted in him getting Blood Manipulation. This is a clear implication that Noritoshi possessed the ability to manipulate his own blood as well, and that is what Choso ended up inheriting. How good exactly he was with this power is something that fans do not know at this point in time.