Blood Transformation Technique, Narutopedia

Using the Ketsuryūgan's abilities to manipulate a target's blood, the user can expand the blood in the target's body. Doing so, it will cause the body to morph into a much larger version, effectively disguising the target to be indistinguishable from their true form. By cutting their wrists to expel the extra blood, the target will return to their original state. Body Alteration

Hanzo Uchiha's Notepad

💜Hinata💜, Wiki

Blood transfusion - Wikipedia

Transformation Technique, Narutopedia

Is Orochimaru responsible for the great power gain in Sasuke? - Quora

Non Elemental Techniques

Blood transfusion - Wikipedia

Tsunade, Wiki

The Shinobi Class Guide