I try to go for variety, I really do, but I tend to have a lot of stoic, detached characters.
I also have a lot of characters who feel like they aren't good enough. Their core struggle is that they have to strive to be be better to achieve stability in their world. And I don't mean that douchebag who is clearly the best and acts like they aren't, but someone who can even be as competent as everyone else and feels like they aren't. Maybe they grew up being always beaten down and told they weren't good enough. Maybe they failed their military unit, costing people lives, and it's informed everything else in their life and they just don't feel confident enough about anything anymore...
So a lot of my characters either:
a) Are emotionally distant and/or stoic
b) Lack self-confidence
Sometimes it's both.
I do mix it up sometimes. Garden is a good example of that. She's emotional and she's confident af.
Audrey @ Reno, however, is an example of A. She fronts most of her emotions while drinking away the rest.
There are some people I judge for the characters they play. Usually it's those who play very two-dimensional characters that I end up dreading getting into scenes with, esp. one-on-one because I know it's not going to be an engaging scene, there won't be any effort on their end, etc. Meh.
And I rarely associate the character with the player. I'm an author. I dabble in screenplays, too. I don't think, say, Guillermo del Toro is racist for Django Unchained. I'm going to (and have) write some pretty terrible people into my works (we don't hate Rowling for Umbridge!). I actually rather enjoy playing antagonistic characters, but it is hard because of the OOC lashback you receive sometimes. People do often want games to be very ICly copacetic with sunshine and rainbows (this came up in the MU* Gripes thread, re: people wanting immediate resolutions between wronged PCs so everything is right again) and they have a very hard time with antagonistic PCs. Even mildly so.
I love when there can be strife between my PC and another. When two characters don't get along well. I think it's great! But a lot of people can't handle it because they get so invested into their PCs that they think: 'This person's character doesn't like my character, so the player doesn't like ME.'
This is part of why I ST. I can create all kinds of horrible NPCs to play around with. It doesn't make me a bad person! It just lets me stretch my writing legs a bit (plus while I enjoy writing antagonists, I don't want to play them all day; they're best as part-time alts).