How do I become a Hero in die2nite?
Solution 1:
You may now purchase days of Hero time on the Die2Nite website.
There's also another way to become a hero: manage to pull out of a town that has lasted for five complete days as the Last Man Standing, and you'll be rewarded not only with a special distinction but also with a certain amount of Hero days depending on how long you survived. You can read up on Last Man Standing and the rewards here.
Solution 2:
Now that the game is out of beta, you may buy hero time for roughly 12-15$ a month.