Thread:CITRONtanker/@comment-27480112-20170925122759/@comment-26888167-20170927115926

Sounds interesting. I have some other ideas as well.

The first pony character that can be unlocked is Red Fork, obviously. He's unlocked at an early level. After you have him, you can unlock the tasks that involve other pony characters. For example, if you have Red Fork and a science-themed building, you can unlock the task that will unlock Blue Ocean.

Captain Red Shell will be obtained through a task that has something to do with the sea. Perhaps first you'll need to build something like a dock on the beach.

In June there could be a month event where you can unlock Red Fork-related/inspired items, as well as other pony characters that would otherwise be harder to obtain.

From the Crystal Gems, the first one you unlock would be Steven, and after you have him, you can unlock the tasks that will unlock Pearl, Garnet, Amethyst, Lapis and Peridot.

Dark Shadow should have some kind of adventure related to unlocking him. There'd be a special task where you have to find his building, which is in a dark region of the map, and then fight him to unlock him (not sure how that would be though). After unlocking him, you can access his building like any other, and you get the area  the building is in. You also unlock a task to unlock Black Gem.