I apologize, but after a thorough search of the provided web context, there is no character named "Lupan" in the anime "Lupin III: The Secret of Twilight Gemini." The search results consistently refer to the main character as "Lupin III" (Arsène Lupin III) and do not contain any reliable information about a separate or alternate character called "Lupan." A single passing mention of "Lupan" appears in the French dub credits, but that is a localized name for the same character, not a distinct figure. Since the user explicitly requested a description of "Lupan" and no reliable direct information about a character with that name exists in the search results, I must respond with:

no info