Prior to the game's shutdown, several villains from across the Skylanders franchise were intended to be added to the game as enemies. These include:

• Evil Glumshanks from Skylanders: Swap Force
• Super Kaos from Skylanders: Imaginators
• A version of Kaos wearing his Emperor outfit from Skylanders: SuperChargers
• Bobbin Rood, Olaf Crushersson, and Runys Pointyboots from the Nintendo 3DS version of Skylanders: Trap Team
• A Goliath Drow, likely meant to be Brock from Skylanders: Giants
• Malefor, the main antagonist of the The Legend of Spyro games

Had these plans gone through, it would have marked Malefor's first physical appearance in a Skylanders game, with his previous appearances being in the IDW comics, the spinoff TV series "Skylanders Academy", and as a Skystone in Skylanders: SuperChargers.

There were plans to create original Skylanders exclusive to Ring of Heroes before the game's closure. This included a Dark elemental mantis Skylander named Machetis, an Undead elemental bat-esque Skylander named BatGatling, an unnamed kangaroo-esque Skylander, and an unknown green Skylander. Additionally, two skin texture packs for an unknown dwarf character (both regular and awakened) were leaked.