Always a good way to vacuum the cat, running your latest characters through the Mary Sue test.
The second one even warns you that you might be in danger of getting too distant from your characters. . . . OTOH, it said that about one of the characters I think I am most sentimental about. I was just a little creative in how I hosed him down. That's the problem with Mary Sue tests. The only thing they can test are the warning signs.
And once or twice I have gotten ideas about how to make a character more distinctive. 0:) Since, of course, Mary Sue is a matter of 1. dosage and 2. whether stuff is earned or unearned.