If you're familiar with The Sims, then you know that you can download different skins so your family members can change clothes or look like different people altogether.
Anyway, I came upon this website, did some searching, and just happened to find Manny (among other computer/video game characters).
http://www.strategyplanet.com/thesims/skins/vg9.shtml)
It looks like you have to be registered/sign up in order to be able to download the skin. I haven't tried it yet. But anyone who does could post screenshots of Manny's adventures in The Sims.
I've actually found some other adventure game character skins so when I get a chance to organize my links I'll post a list of what I've found.