In the Roblox universe of All Star Tower Defense (ASTD), there are four secret characters. They can only be earned via "Spins" or "Hero Redeems" in the game. Each spin offers players a 0.

Roblox Brainrot Evolution offers a selection of characters based on brainrot memes that players can unlock by feeding and evolving. The only exceptions to this rule are certain Secret Brainrots.