I love it

Except for the fact that I read it as user@domain

I like it!

Technically I think it should be M4735 or M4T35 in 1337/L33T, but that is nowhere near as readable for most folks.

Good one m@te

I like m@tes. I would want to stick with the pirate theme and in lots of the world, "mate" is a friend.

Love the idea of assuming we're all on the same side. Because we are.

Then the circled a is a good reminder.

This is solid stuff, db0.

Ahoy m@tey!

How about b@ts, as in "bats" referring to many things, among them:

• Landstreicher's translation of Stirner's "bats in the belfry" expression
• "Bats," referring to the expression of insanity for our neurodiverse and other friends
• Bats, the animals, live in dark caves and only come out at night (pejorative for us being internet nerds)
• It uses the @ symbol and fits all of your criteria
• Bats are cool