Jinenji is a half-human, half-horse demon who lives in a hut with his human mother. Together, they grow a variety of medicinal plants in the field he inherited from his demon father. Some of the plants are known for being powerful against poisons. He is first seen in episode 31 in the anime. Kirara is poisoned by Naraku's shoki, and Kagome and InuYasha travel to the village to find a cure. When they encounter Jinenji, they learn he is a gentle giant who is initially scared of humans due to the way the villagers treat him, as he is falsely blamed for taking lives in the village purely based on the fact that he has demon blood in him. When they find him, they help to clear his name. His arms in particular are covered with scars from attacks on his person.
Upon meeting Kagome, he is surprised to find that she is not frightened by his appearance at all and willingly helps him collect herbs. InuYasha, having also dealt with abuse at the hands of humans when he was a child, attempts to convince Jinenji that he needs to be more forceful towards the villagers, especially after he rescues them from a demon. In the end, Jinenji decides to continue his more gentle approach, giving the men injured during the demon attack the herbs they need to heal themselves. Out of guilt for having treated him so badly before he had saved them all, the village men help Jinenji and his mother rebuild their hut that the men had burned to the ground, and clean up the herb field.
Jinenji becomes fully human one day a month, but unlike InuYasha who becomes human at night, Jinenji becomes human during the day. He spends that day hidden away in the hut, under a blanket. Likely only his mother knows what his human form looks like, as he refuses to let anyone see him. However, it does appear that he becomes a larger-than-average human. In the anime: during one of these times, Rin visits his home searching for the cure to heal Jaken, who was poisoned by the Saimyosho while protecting her.
Jinenji is obviously very strong, as his body suppports a large amount of muscle mass, but his one known demon ability allows him to become even stronger. Activating his power makes his entire body glow with blue energy, and he was able to decapitate a large demon by wrapping his arms around its neck and squeezing with brute force. He then destroyed the head with a single, devastating punch, making it virtually explode into dozens of small chunks. At the end of the final episode of InuYasha: The Final Act, Jinenji was last seen helping Kagome pick out plants to make potions.
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