* ArchivePanic: While not as infamous about this as WesternAnimation/DonaldDuck, Mickey's career in animation, comics, tv shows, video games and merchandise spanning well over 85 years is very tough to manage for a casual fan. And considering he is the face of Disney, they're unlikely to stop making stuff with him anytime soon.
* MyRealDaddy: While practically synonymous with Creator/WaltDisney, some attribute Mickey more to Creator/UbIwerks as he was the one who designed him. Others opt for co-creator status (Disney with his personality, Iwerks with his design). There's also Creator/FloydGottfredson, who retained Mickey's adventurous personality in the comics for several decades.
** This is also the case for voice actors. In the modern day, most people associate and accept Mickey's voice with the late Wayne Alwine, who had been doing Mickey's voice since the early 70s.
* VanillaProtagonist: One of the most iconic cases. Mickey's increasingly laid back personality made him look like a FlatCharacter compared to more abrasive and emotional co stars such as Donald, Goofy or even Pluto, thus he slowly ended up DemotedToExtra in the classic shorts. Modern projects attempt with wavering success to make him star material again, even if ultimately, his StraightMan role is still the most iconic.