For accounts I care about: My usernames are pretty random, though that largely depends what’s allowed through the service. A lot of them are some version of my name because the site generates them (government stuff and whatever). Just whatever sounds good at the time is what I go with. Passwords are generated and stored by bitwarden, and I never really think about it.

For accounts I don’t care about, like shopping accounts I’ll use once, and never touch again after the 20 min use they got, they all get the same weak and pwned username and password combo so I can easily remember them. Don’t care if they get hacked. What are they gunna do with my shipping address? Send me stuff? Oh no.