Minerva “Minnie” Mouse was created as Mickey’s girlfriend, Mickey Mouse sewing is not a hobby it’s a 2020 survival skill shirt, not his wife. I am not sure if in the 90 years they have been together (she appeared for the first time in Steamboat Willie in 1928) they got married but the reason why she has the last name “Mouse” is that she is a mouse and other last names would complicate things and make no sense. Technically, a fictional character does not have separate copyright apart from the creative work in which it appears. If you were to use a character from someone else’s copyrighted work whether that work is a novel, a play, a television show, a movie, a painting, or an illustration without their permission, then you would be creating a derivative work that probably infringes on the original work’s copyright.
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So, the real question is Who owns the copyright to the Mickey Mouse sewing is not a hobby it’s a 2020 survival skill shirt works in which Minnie Mouse appears? The Minnie Mouse character first appeared in the 1928 animated short Steamboat Willie, and the copyright to that work is currently owned by The Walt Disney Company. The Steamboat Willie copyright will expire in the United States on January 1, 2024; however, later derivative works featuring Minnie Mouse will still have copyright protection. So, any original visual representations or character story elements for that character introduced in those works would be legally protected against you using them on your own without The Walt Disney Company’s permission.