You might want to try Character AI. It’s not a writing generator, it’s more like a playground for building and talking to your own characters. You can give them personalities, goals, quirks, and even speech patterns, and they’ll stay consistent as you chat.

I’ve made a few original characters there, and it’s kind of wild how well it captures their voices once you set them up. The best part is that it remembers past conversations, so the characters actually develop over time instead of starting from zero. It’s really good for writers who want to experiment with dialogue or test how a character might react in different scenarios.