The closest Robot Chicken ever got to a Foster's parody is a couple of vicious stabs at The Powerpuff Girls.
If RC does decide to parody Foster's in the near future which could be an outside possibility seeing as how they like to poke fun at practically everything on that show from the mega popular to the obscure, then Hopefully they'll be able get Keith to reprise Bloo. After all KF did lend his voice to a couple of episodes of RC, most notably the two Star Wars specials.
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