As the name implies, Puppet Manipulation allows the user to remotely control cursed corpse puppets. The puppets are capable of receiving and discharging their master's cursed energy, as well as using different cursed techniques through a variety of methods. The puppet manipulator shares vision with the cursed corpses while controlling them remotely. They are also capable of using their technique to pilot a manned puppet.
Kokichi Muta was born with a Heavenly Restriction that cursed him with an unhealthy and highly fragile body. In exchange, Kokichi can output vast amounts of cursed energy that stretches across all of Japan, allowing him to use his Puppet Manipulation over a wide range.
In order to attend Kyoto Jujutsu High as a student, Kokichi manipulated his Ultimate Mechamaru puppet to act as his stand-in proxy to physically attend classes and go on missions. As a second-year student, Kokichi was recognized as Mechamaru, with everyone referring to him as such. Along with his physical interactions with the world, Kokichi's social actions were through Mechamaru as well. His peers had no idea what he actually looked like, but Panda and Kasumi Miwa both said they would come to visit him eventually.
In a Binding Vow with Mahito and Geto, Kokichi agreed to manipulate unregistered puppets with his technique in order to steal information and pass it on to them. In exchange, Mahito agreed to heal his body using Idle Transfiguration. Following his healing, Kokichi and Mahito engaged in battle. The fight began with several Mechamaru's storming out of Kokichi's secret lab. Kokichi used this as a decoy to escape and enter his experimental armored puppet, Ultimate Mechamaru Mode: Absolute.
While piloting Mode: Absolute, Kokichi used seventeen years' worth of stored-up excess cursed energy to fuel the giant puppet. Mode: Absolute was essentially a giant Mechamaru, but it had incredible speed and power as well as the ability to momentarily output special grade levels of cursed energy.