clarkwinkelmann the more, the better - when creating a discussion/post, deleting a discussion/post, marking discussions as read... at least all the "extension-less" Flarum actions available, maybe when someone likes a post too.
If you do a certain action, then an animation plays.
Maybe Clippy could occasionally speak too? Not sure what to make him say, maybe just some Flarum tips, eg.: when you are admin and you close the welcome box above discussion list, Clippy will tell you that you can change it in the administration area, bla bla. I know that people will already know about this before they install this extension, but it would give the assistant some life.
And a user profile setting to toggle the assistant would be nice too.
These are my ideas, maybe you will not implement them all, but that's fine, do what you think is right and have fun!