|Japanese Name||護 (まもる)|
|Debut||Episode 01 - The Indelible Dream|
|Japanese Voice||Haruka Ishida|
|English Voice||Greg Ayres|
Mamoru has shaggy Brown Hair and Brown eyes.
At first, he doesn't seem to like idols. Be when Yuka left Lancastar, he decided to do some research on idols. Since then, he has become very fond of idols, especially Suzuko, however, he secretly fonds over Yuka even more. He tells Yuka that he loves the Yuka that's the 00 member, but no longer loves the Yuka that wasn't. Aoi teased him about whether or not he voted only for Suzuko at the General Elections, implying that she suspects or knows that he loves Yuka, and most likely even more than Suzuko.
- Mamoru means 'protect' in Japanese.
- Mamoru plays soccer.
- His seiyuu, Haruka Ishida, also voices Kanata Shinonome.