Eider made his first visual comic appearance in The Empire-Builder from Calisota, where he was shown working at the Duck family farm. He later made a brief cameo appearance as a background character in Duckburg in the crossover comic Dangerous Currency.
Eider was also shown on a portrait on Don Rosa's Duck Family Tree, as the husband of Lulubelle Loon and the father of Whitewater and Fethry Duck. Given the fact that, in O Nascimento Do Biquinho, Fethry mentions that he has got a sister, Eider and Lulubelle would have at least one daughter, making him the grandfather of Fethry's nephew Dugan.
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