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Inuyasha's full-youkai older half-brother. He rarely shows emotion, and speaks only briefly and infrequently, so he's difficult to figure out. Though he gives the impression of not caring about anyone else, he's been traveling with and protecting Rin, a young human girl, for quite some time now. Sesshoumaru tends to ignore his underling Jaken, and tolerates but doesn't get along well with Inuyasha.
Sesshoumaru bears 天生牙 (てんせいが), one of two swords made from the fangs of his father (the other is Inuyasha's Tessaiga). He initially disdains it, because it is incapable of killing. However, after it saves his life by protecting him from Inuyasha's Kaze no Kizu, he takes another look at it. Testing it out on the recently killed Rin, he finds that the sword allows him to see and destroy otherworldly spirits, as shown to the right. By disposing of the beings that come from the next world (i.e., afterlife) to bear the dead there, it saves lives and can even reverse recent deaths. Besides killing otherworldly beings, Tenseiga has also proven effective against the undead.
Toukijin has since broken, snapped by Sesshoumaru in an uncharacteristic fit of rage on Kagura's behalf. However, Tenseiga, sensing the change in his heart, calls out to Toutousai, who reforges it to have offensive capabilites. The new ability 冥道残月破 (めいどうざんげつは), literally 'dark road' + 'dawn moon' + 'destroy', slices open a crescent-shaped rift to the world of the dead, which takes in the victim's body, or at least a crescent-shaped slice of it, as shown at left. According to Toutousai, the rift will grow larger, eventually reaching a ful circle, as Sesshoumaru improves.