These are a few test screenshot overlays featuring Otto. The text can easily be edited and the Talk Bubble can be resized to accomodate any description. I have drawn a couple different facial expressions for Otto, but I haven't been able to draw a decent "hand". I also made an OOo hat for Otto to wear, scroll past the screenshots to see him in it.
These images, the full-size .jpg's and a 1024x768 .psd template are available here:
A few different looks...