There have been several people with the title Kira who caould kill with a death note, Light Yagami, the original Kira, the second Kira Misa Amane, Teru Mikami a puppet Kira used by Light, Kyosuke Higuchi, a third Kira and the "cheap Kira", a Kira in the epilogue who killed those who wanted euthanaisia. Also the Shinigami all the "Kira" ability.