Nagi Matsuo (松尾 凪 Matsuo Nagi) is KiNinger (キニンジャー Ki Ninjā, Yellow Ninja), who is known as The Agile Ninja (身みがるな忍者にんじゃ Migaruna Ninja),[1] the Yellow Ranger of the Ninningers. Being 16 years old at the beginning of the series, Nagi is the youngest member out of the Ninningers.