Genie, Merlin, Robby or Peedy. Again this goes quickly. You will see a little parrot icon in the system tray. With this command you can make Peedy to think texts. You can also have it think at the same time.
Installation takes only seconds.
A lot more commands for interaction with the characters are available. See the mIRC helpfile for details. Lots of other 'homemade' Agents are available already, look at this very informative website with characters like Oscar the Cat, Max the Dog, Santa and some Aliens. Other names of actual companies and products mentioned herein are the trademarks of their respective owners.