Grimace is a character featured in McDonaldland commercials. He is a large, purple anthropomorphic being of indeterminate species with short arms and legs. He is known for his slow-witted demeanor. His most common expression is the word "duh" before every sentence.  As time went on, Grimace's family was seen in commercials and the VHS series "The Wacky Adventures of Ronald McDonald". Grimace’s mom is Grimabeth, Grimace’s dad is Louie Grimace, a grandma named "Winky", a great-great-grandma named Jenny Grimace and a brother named King Gonga (who rules over all Grimaces). In a 1999 commercial for McDonald's, Grimace has two aunts named Millie and Tillie, whom Ronald mistakes for actual ants while on a picnic. While many family members have been mentioned, most heavily seen and mentioned is Uncle O'Grimacey who came one month every year, around St. Patrick's Day in March, to bring Shamrock Shakes.

In MUGEN, Grimace is a very skilled fighter, doing tricks with his skateboard, jumping with this spring and tons more, even gives the opponent his birthday shake.

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