|First Appearance:||Pokémon: Mega Evolution Special I|
|Voice actor:|| Mikako Komatsu (Japanese)|
Zoe Martin (English)
Mairin is a character who appeared in Mega Evolution I.
Mairin is a Pokémon trainer and companion of Alain. She begins her journey after receiving her Chespin, and soon enough meets Alain while observing his battle against a Mega Absol. Mairin can be seen as clumsy, tending to fall over nothing and finding herself stuck in numerous situations, but also curious and highly persistent, as she chases after Alain, quickly taking a liking to him.
Beginning her journey, Mairin often questions numerous things revolving around Pokémon, which frequently results in Alain explaining things to her. Although it is unclear, Mairin states, after meeting Alain, that her dream is to catch as many Pokemon as she can and mega evolve them.
As a novice trainer, Mairin is often seen as curious, energetic, and an extreme klutz, to the point where it can be considered comedic. Mairin exhibits great care in her Pokémon, and at times boasts of her ambitions which she is teased for. Despite all this, she quickly warms up to kind people, which may have been a considering factor as to why she followed Alain. In certain situations, she is obedient and is greatly concerned when her friends are harmed, worried for their overall well being.