User blog comment:Agentluke0322/RBoAT Bonus 1: Mario vs. Bowser/@comment-34129479-20190628220548/@comment-27614603-20190629152956

Eevee vs. Pikachu: Seen it already on YouTube, but might put a spin on it.

Elmo vs. Elma: Too loose of a connection.

Dr. Robotnik vs. Dr. Wily: Same situation as Eevee.