Senketsu

Ryuuko’s got a wild fashion dilemma with her unique buddy, Senketsu—a living sailor uniform she dug up under her house. This isn’t just any outfit, though; it's a Kamui, or "God Clothes," giving her epic powers in exchange for, you guessed it, her blood! Senketsu can morph into this badass suit of armor, but let's be real, it's kind of skimpy, which makes Ryuuko blush a bit. She even named him "fresh blood." In a dramatic showdown, after taking down Kiryuuin Ragyou, Senketsu sacrifices himself, burning up as they plummet through the stratosphere to keep Ryuuko safe. Talk about a fiery friendship!