I think the only thing my characters have in common is that they're male, they're generally young (so as to be more active) but I've played wizened older characters in big roleplays, and they don't sexually harass anyone. I would say "because I find that reprehensible" but I murder people and steal in roleplays and I wouldn't do those in RL either so

But I play all kinds. To name a few I've been a

[list]
[*]Hardened merc
[*]Slave
[*]Crazy pilot
[*]ruthless captain and swordsman
[*]Suave cutthroat
[*]Con man
[*]Heroic Knight
[*]Warrior Monk
[*]Academic Sorcerer
[*]Academic 1930's Adventurer
[*]PTSD Soldier
[/list] 

Etc. 

I guess none of them have any problem going into combat either, which is the last similarity. I did start out with a very narrow set of caricatures, but over the years (as Odin stated) I branched out. I don't think anyone should be criticized for playing in their comfort zone either, however. It's all in good fun and as long as your partner doesn't mind, you shouldn't let anyone tell you what to do.