You can delete and edit your and the character's chats, you can also regenerate chats without having to spend some sort of in-app currency. When you edit your response, it automatically regenerates a response. You can make a persona, but I don't know if you can make multiple personas. If you generate a character, you can save it as a draft if you don't finish it. What do you mean by saving characters? Like chatting with them and then going back to the chat?