In addition to the “masked guy” character, here are three places to find some freely available character rigs: 11-Second Club, Creative Crash, and Lester Bank’s blog post. Look around and choose one that you will have fun using and also wouldn’t mind seeing a lot.  Or seeing on your reel — which by the way, if the license accords non-commercial use, you are welcome to use these for your reel. (You should, of course, credit the source for the model and rig — but there is usually a breakdown on your portfolio/reel submission where this is done for every shot in your reel). There are a lot of fun ones, and some of them (such as the Andy Rig) are configurable for different looks.