It's time for the second TV Tropes Halloween Avatar Contest, theme: cute monsters! Details and voting
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Every single one of the Pakistan Happy Meal ads. All of the Sonic characters are missing defining traits (for example, Rouge the Bat is a ) and ending up looking butt-ugly, mouse Neo Cortex missing the N on his forehead, Hello Kitty looking fat and having a mouth, and so on.
And then notice how the McDonald's mascots keep changing their looks throughout each commercial.
The USA commercial for has an off-model CGI model of Rayman, with a very oddly-shaped torso and inaccurate eyes. ( Rayman 3: Hoodlum Havoc View the commercial in HD here.) Just compare how he looks in the game to how he looks on the commercial.
This commercial for a Korean SNES ad. Not only does it manage to make this the video game commercial equivalent of Cartoon All-Stars to the Rescue, the animation studio ( Dai Won) manages to screw up Ryu, Chun-Li, Bowser, Krillin, Goku, Raphael... Pretty much everyone except Mario and Buster.
As if the show, comics and toys were not enough, the commercials of Transformers G1 also end up falling into this trope. Two in particular stand out; the very first one, using entirely different models for The Ark, Megatron and the Seekers. And this one, which truly showcases how much of an Expy Jetfire was. This Chile commercial also contains a gratuitous amount of this trope, though this is because neither Toei or AKOM provided the animation.
An M&Ms commercial from Madagascar (the country, not the movie) has horrible-looking models of the M&Ms mascots; they're completely hollow on the inside with no tongues and they appear lumpy whenever they move their limbs.
An Italian ad gave Yellow a set of teeth.