RWBY's character dynamics are fascinating, especially when you dig into the darker corners of its lore. While the show doesn't explicitly label anyone as a 'yandere' in the classic sense—think 'Mirai Nikki's Yuno—there are characters with obsessive tendencies that flirt with that archetype. Neo Politan stands out to me; her silent, vengeful devotion to Roman Torchwick and later Cinder has this eerie intensity. She doesn't just fight for them—she lives for it, and her smile during combat is downright chilling.
Then there's Cinder herself, whose obsession with power and revenge against Ruby borders on unhinged. The way she fixates on destroying her enemies, especially in later volumes, has that single-minded, destructive flair. It's not the 'love-driven madness' of a yandere, but it's close in spirit. The show's more about battle mania than romantic obsession, though, so don't expect traditional yandere tropes to play out.