I'm considering running an online play-by-post game of a He-Man rolplaying game system I wrote: https://app.box.com/s/bb9fjiuqb27s0vzqti53. I think it may be well suited as a play-by-post rpg, either on rpg.net or therpgsite, but I haven't tried yet.

If you're really into RPG design, then I have to say include a 'trigger warning'; it has narrative mechanics, and the conflict resolution does not use dice. (Why the hell would you do that? you ask) There are many roleplaying games with barbarians wielding blasters, so this does not try to be one of them.

Instead you get drenched in sickly-sweet nostalgia as you play a kid playing with a toy recreating an episode of the TV show, complete with ending PSA ("And what's why you don't do drugs, kids...") This is a very different kind or roleplaying game; it's not for everyone, but it can be a lot of fun for the right taste.

Check the rules out, anyway. Let me know if you have any interest.