Bisuke is one of Kakashi's ninken—basically a ninja dog that fights alongside him. He's probably best known for looking eerily similar to Gaara, which fans definitely notice. Both have that distinctive kanji mark on their forehead and the dark rings around their eyes, but where Gaara's character is defined by the kanji for "love," Bisuke sports the kanji for "shinobi" instead. It's a small detail that actually says a lot about the two characters.
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