I have seen a few Mickey Mouse pictures with him cooking on a three legged domed grill. I even have a couple of pins from Diseny World with Mickey and friends with a Weber, although it never says Weber. I also have a small statue of Mickey cooking on a Weber. But I haven't seen a Weber with Mickey on it. Diseny did have a small SJ size grill with mouse ears, not a Weber though.
There is a Flintstone picture I have with the gang cooking their famous ribs the size of a house in a green kettle shaped grill.
Homer might have the distinction of the only fictional character to be immortalized on the lid of a Weber kettle.