Kotetsu

Kotetsu is a tsukumogami who manifested from a time-worn Japanese blade, taking the form of a young boy with neat bangs and a short hunting robe. As the dedicated weapon-partner of Sunao Sumeragi, he carries a quiet, yielding nature that often leaves him at the mercy of Sunao's commanding personality. In battle, he endures the direct impact of every sword strike upon his own body, yet never wavers in his commitment to protect his partner. This wholehearted, self-sacrificing devotion makes Kotetsu one of the most quietly compelling support figures in the series.