Good question! I don't know if this is a classic character/personality, but lately I've noticed that a lot of my work has the "stoic older brother" type in one form or another. How about you?
My characters tend to be super sarcastic or snarky; I don't know why, only that's it's been that way since I've started writing. It used to be a huge problem because I thought my characters all sounded similar, but I've learned how to trim and tailor it to each character (or at least, I hope I have!).
I find I keep writing from a younger girls point of view; classic, because it's what I know. But I'd like to branch out and get into the head of someone more removed from myself. I spend a lot of time in secondary characters heads, maybe more because I know my main character far better. It is good practice, but I haven't fully committed yet.
My main problem is that I always think from a female POV, and so my characters tend to be females. Come to think of it, I don't think I've ever written from a male's POV. It would also be fun to leave the gender of the narrator ambiguous...
EBlanco, I've read some fantastic flash fiction that leaves the gender ambiguous in first person POV. It'd be really interesting to read a longer piece written that way (and probably super challenging to write).
A common archetype that shows up in my stories a lot is the reluctant hero with a troubled past.
My protagonists tend to have one singular past regret that they need to get over (an action, a lost love, etc) or if they don't, that typically means they're the villain of my story.
I've found the aggressive and fiery female character shows up somewhere in my stories; either as the protagonist or a side character. As well as, characters who are blind in one eye. One of those things that I hadn't noticed until after the third or fourth time.
I have a character that I've used repeatedly to the point of going out of my way to kill off just to give me an excuse not to use him again. That being said, most of my protagonists have something affecting their eyes.
Tricksters. Love 'em. And there can always be more than one in a story. Let's face it, not everybody is on our side on a daily basis anyway.
My main characters always end up with a disability.