 If you liked
Mahou Shoujo Lyrical Nanoha
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 ...then you might like
Shamanic Princess
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Lyrical Nanoha and Shamanic Princess are action-packed magical girl shows that are aimed at a more mature male audience rather than a young girl one. Both shows involve rival magical girls fighting over a certain object (or multiple objects, in Nanoha), and include darker themes and events. Also, the main characters have a ferret partner.