I might get some hate for this but, I really don't like the anime humanized characters of Micky/Oswald. Mostly because when I see them, I always picture there voices in my head which makes the characters seem weird to me. Plus people tend to draw human characters younger than they look/seem. It's perfectly okay if you like or draw those sort of things, it's just not my cup of tea.
Anyways I do imagine bot Oswald and Mickey to be adults. Mostly because they live on their own/have kids. Mickey being in his late twenties and Oswald possibly in his early thirties. Both of them probably work in the show business together running Disney. But Mickey works up front making him famous and Oswald working behind the scenes not really being known to the public. Both are pretty neutral to each other. They're bros so they have a somewhat sibling bond but can get into arguments at times.
Oswald is much paler than Mickey and Mickey is thinner than Oswald. Both of them are amazing with kids.... sometimes. Also the ‘widows peak’ is based from the pattern on their face!
Also, Mickey's outfit is based off of the mascot costume and I made up Oswald's.
I hope you like them!