* ArchivePanic: While not as infamous about this as 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 WaltDisney, some attribute Mickey more to 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 FloydGottfredson, who retained Mickey's adventurous personality in the comics for several decades.