One of the things that made Karin stand out from other characters is her medical ninjitsu. Unlike other ninjas in the series, who would put hands on the wounded and use chakra to heal their wounds, Karin does so via biting. In other words, a person has to bite the ninja to heal her or his wounds. While this is one of the most powerful healing techniques in the show, it has its limitations. The biting cannot be used more than once a day, and it can be very exhausting for Karin.