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|First appearance||Keroro RPG: Kishi to Musha to Densetsu no Kaizoku|
|Voiced by||Hikaru Midorikawa (Japanese)|
|Species / Type||Pekoponian|
|Occupation||Knight to Princess Summer|
Rein has a talking sword named Kerosu (ケルロス), that is extremely strong. He is extremely skilled in sword fighting.