Strongest female filler character: Guren

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How strong was Guren (Filler character) : r/Naruto

Seraph of the End: Guren Ichinose - Catastrophe at 16 Manga Takes 1-Month Break Due to Author's Health - News - Anime News Network

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You have to opportunity to make one filler character manga canon. Who will you choose? Here are a few of them that I remember (You do not necessarily need to pick one