This collection encompasses references to Cornelia Funke's novel *Dragon Rider* and its characters Firedrake, Ben, and Twigleg. It also includes the unrelated fantasy anime *Raikou of the Dragons* (2003/2020), featuring Sumiko Kuronami but no character named "Raiku." Additionally noted is the 1995 hentai OVA *Dragon Rider* with characters Rike and Karisu. The *Battle Spirits* card game contributes "The ThunderHero Raikou-Dragon," a character derived from the historical Minamoto no Yorimitsu (Raikō). Further references involve Japanese folklore elements like Ushi-oni, unspecified game content, and voice actors for unrelated projects. No official media (seasons, movies, OVAs, spin-offs) related to an anime character named "Raiku" within *Dragon Rider* is documented.