Kohaku

Kohaku was killed by a demon named Naraku who was posing to be a castle's lord during one of the yōkai taijiya's missions and was made to kill every yōkai taijiya that was there, including his father, in order to blame Inuyasha. He is later revived by Naraku as a human puppet against Sango with the only purpose of stealing Inuyasha's sword, the powerful Tessaiga, and had a Shikon Jewel shard embedded in his back to keep him alive and under the control of Naraku without memory of what he had done. Kohaku, at first before being slain, was inexperienced with his weapon, a kusarigama (a demon bone sickle on a chain). He then becomes a rather advanced wielder with the power of the Shikon Jewel shard.