Yes
This has a feature that causes the bot to reply to first posters within specified Categories. You can tailor how it responds by Category. I have used it to reply to Users introducing themselves in the Intro category, for example.
In general, you can talk to “Chatbot” by @ ing it wherever you like, so long as it is permitted to speak there. You can name the bot whatever you like and give it a special avatar.
I trust you’ve also looked at Discourse AI which has a whole host of AI features too.