I'm self (and that icon is actually part of the spelling)
. You're welcome to refer to me by other names, but I won't respond to them here.
Beyond that, though, I always thought the aliases were stupid. Rather than protect privacy, they invite people to break your code, and the only folks who won't easily do so are the ones who've never met your friends.
I use pronouns, and invoke poetic license to make other words function as pronouns. He, She, Teacher, Friend, Cashier, etc. This gives them form without focus, or possibly vice versa.
I may use differemt terms to refer to one person over the course of a few posts, and I may use the same pronouns to someone else over time. Things that can only refer to one person sometimes don't. There's no traceable pattern, and this prevents me from inadvertantly compromising the layer of abstraction.(and yes, I do occasionally provide a stronger clue. but then you usually ask for details, and I throw up my hands in frustration)
Anyway... I'd say go with #3
, because it lets you judge each post individually and decide if there was too much information about someone else given. If so, you can tag that post as private, or go in and edit it further. Otherwise, you're always at risk of having crossed the line retroactively...