I have been poking around with some stuff, but mostly just ideas in my head. So for "collaboration" I mostly imagine getting ideas from each other, trying each other's stuff out, all very low commitment. Like you know when you find someone who when you talk about ideas together and you both come away more excited than when you started? If there's any community where people do hang out like this that would be cool, though the tedious and tired commercial chatbot discussion seems to dominate.
Some thoughts I've had:
1. How do you make a really creepy bot? (Barring profanity, racism, etc) Sometimes people worry about creepy bots but I honestly am not sure how a bot would be creepy. Making one on purpose might be a way to find out
2. Bots are often very reactive without any will of their own. What kind of personality or (imagined) motivation might make a bot proactive? Would that solve some of the "I don't know what you mean" problem of a chatbot? Like instead of a bland response when the bot doesn't understand, it can instead push back on what it cares about.
3. In this vein I've thought about a depressed bot, and your job is to find a way to cheer it up.
4. User-programmable bots. I've been thinking about this in user-buildable VR worlds. The worlds are all so empty. Can we make it feasible for a person to create their own NPCs?
5. Can a bot be loving and supportive? If it's just a façade, how good of a façade is enough to generate emotional response?
6. How do mediums like text vs voice impact this stuff?