/r/rational is a subreddit originally started by the fans of Harry Potter and the Methods of Rationality. Currently it's dedicated to discussions of "smart fiction", including rationalist fiction and hard scifi.

Go check out The Gamer. It's about a guy who gets magic powers (though he can't reveal them to the public or else the source tries to kill him), and actually behaves sanely (actually thinks "how can I use this to help ordinary people? Probably by focusing on healing magic and becoming a doctor."). Not quite rationalist fiction, but contains non-stupid characters and good humor.

Tower of God is a great webtoon/manhwa for people who like games with simple rules that lead to complex stategies, small group politics, and action. There's a lot of complex world building and lots of twits which makes the plot diffult to explain, but here's a basic overview. The story follows Baam who grew up in a cave with only a single friend, Rachel. One day Rachel decides to excape the caves by climbing the Tower, so that she can see the stars. Each floor of the Tower has a test (or series of tests) you have to pass in order to advance to the next level. People who reach the top of the tower are rewarded with immense supernatual power and social status. Thus many people attemp to climb it even though the second floor alone has a worse than 50% mortality rate and your chances of reaching the top are on par with winning the lottery. Baam attempts to follow her into the tower, but gets seperated from her and dragged into on of the tower's internal politcal stuggles. ETA- The link at the topic is to the official site, but Batoto also has a very high quality fan translation which is quite a bit a head of the official English version (several hundred chapters vs 11).

I have recently started reading the blog Mr.Money Mustache. It is about early retirement, but many of the lessons can be applied to earning to give. The blog makes good use of hedonic psychology and some basic rationality techniques (like actually using math).