In February 2022, a Twitter user datamined Super Mario Strikers to reveal several unused character models. The unused character models include:
• Generic Mario-style humans, and unused Donkey Kong-like characters (most likely suggesting that captains were going to have their own unique sidekicks themed after them).
• An early model for the Medic that resembles Dull Bones from Paper Mario.
• A Security Pianta that only appeared in the pre-release builds of the game.
• A Goomba Guard that appears to be related to the cut stage "peach_palace"