Crazy and out my ass but what if black blades are forged through a sacrifice. Like something crazy like killing a loved one or suicide. It being similar to zoan awakenings requiring death but still unique
We know Aramaki’s tattoo hints at suicide and death of a loved one. So maybe the sword originally belonged to a girl he really loved whether familial or romantic. Her death being what made the blade black with Aramaki deciding to hold it as a part of her. He can probably use it too but only when pushed to

We know Aramaki’s tattoo hints at suicide and death of a loved one. So maybe the sword originally belonged to a girl he really loved whether familial or romantic. Her death being what made the blade black with Aramaki deciding to hold it as a part of her. He can probably use it too but only when pushed to
