Way to highlight an actor?

I'd like to select a character by clicking them. Is there a way to say draw a line around them without doing a separate animation? Or any other ways to do this?
Thanks
Tom
Thanks
Tom
Comments
Thanks for that. I'll try that out. Another thing I thought of was using particles to create an arrow image over the actors head that points downwards and moves down.
Thanks also for the tutorial videos. I spent a good few days going through them and they've helped immensely.
Tom