While Isolde was never properly introduced within Witch's Resurrection in any official capacity before it reached its end of service, and as such, her name was never revealed in-game or in promotional material, a post made to Twitter with her character design did not remove the katakana of her name, unintentionally revealing it before the game's end.
Isolde was designed by Fuku Fox, the illustrator of the Tanpenshuu novels starting from Volume 7 and onwards.
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