I don't want people who will play my games to effortlessly find who I am and what other things I do online.

This sounds like more anonymity than Scott Alexander has. Scott's real name is easy to work out from reading his blog. What you can't easily do is google his real name and find SSC.

(OTOH, I suspect it wouldn't be too difficult to go from SA levels of anonymity to the level you want. Someone who didn't know Alexander was a pseudonym could probably read much of SSC without ever realizing. Don't quote news articles about your brother, and don't link to other websites controlled by you, and you're probably safe unless you get a determined stalker.)