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Koskero dark hair reaching to his chin, with bangs covering most of his forehead, and also sideburns. He also has a stubbly goatee.
- As with the other Galopoula Expedition Force members, Koskero's name originates from a character from Kiteretsu Daihyakka. In his case, his name is simply an anagram of the character Korosuke's name (コロ助) written in Katakana (コロスケ).
- According to Volume 15, Koskero likes: