Self inserts can be good or bad. So please don't get the wrong damn idea. I never said all self inserts are bad.
Anyway that's not the point here. Some people seem to think that a self insert is always exactly or VERY close to how the creator is. That isn't always true.
[I previously wrote this somewhere else but I'll post it here too]
The thing about some self inserts is they sometimes don't look or seem too much like the creator at all. But that's the point. Emotionally, the character IS them but with features and additions that the creator WISHES she or he had. So basically they're self inserts as well as wish fulfillments. A greater more preferred version of themselves. Often in the cases of canon x oc, (Or just plain out character inserting) they are altered and changed so they can better worm their way into fitting (or standing out) in whatever universe they're being put in.
This isn't ALWAYS the case but I believe it's a common thing in Mary Sues, especially Sues that are paired with a canon character.
Again though, I'm not saying every single one. So don't throw a temper tantrum.
I'm just generalizing. Also this isn't about self inserts being good or not or being sues. This is more about giving a better understanding to a TYPE of self insert.