The main thing I hate about anime, is that the main an character and support characters must always be somebody special. The character always has a dark past, locked potential, or some kind of other amazing hidden destiny. While I understand that Destiny is a staple of a lot of anime storytelling (And that destiny usually leads to more skills and whatnot),but it just doesn't stick anymore.
For example:
Let's take bleach, an anime that almost everybody has seen at least once. Every character in that show is some kind of expert, or has some sort of dark, broody past. Now that makes for a terrible cast of characters. We already know each will survive because of said skills, and displays every single kind of character trope possible. If they don't have any amazing abilities, they have the life expectancy of about three or four shots (If their lucky).
I think that many anime's would benefit from a character that is literally just a normal person (or equivilant), that does not get tons of skills/abilities by the end of the series. Now this may sound taboo , because most characters need to progress otherwise they become boring. However, If this hypothetical 'norm' is played well enough,(And not as some kind of straight-man) they could become a very interesting character, without the use of adding stupid amount of skills.
Now I need to go bash my skull in, for that now I sound like my english teacher, mixed with my t.v productions teacher.