Nyctereutes procyonoides, the raccoon dog, which in Japanese mythology is depicted as a master of disguises and shape-shifting, and in character is mischievious and merry but also gullible and absent-minded.
Glossary: tanuki
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tanuki (タヌキ or 狸)
Referenced from: Mirage 2, Mirage: Saiai no Anata e, Mirage 7, Mirage 9, Mirage 11