TV Special
Description
Mairin is a young Pokémon trainer starting her journey in the Kalos region, characterized by fair skin, orange eyes, and spiky maroon hair. Her outfit includes a yellow long-sleeved shirt, a light green cloak with darker edges, dark green pants featuring light green triangular accents, brown suspenders, gray socks, and brown shoes. Accessories consist of a yellow-orange scarf, a green hat with orange triangles and a yellow pompom, and a bracelet on her right wrist.

Her personality blends energetic curiosity with persistent determination. She develops a deep fascination for Mega Evolution and pursues knowledge about it by following Alain despite his initial objections. Exhibiting cheekiness and occasional emotional vulnerability—especially concerning her Pokémon—she demonstrates loyalty through actions like protecting Alain during peril, risking her own safety.

Mairin begins her adventure after receiving Chespin, nicknamed Chespie, from Professor Sycamore. Intrigued upon witnessing Alain battle a Mega Absol, she resolves to follow him to learn about Mega Evolution. During their travels, Alain advises her on capture techniques, leading her to successfully catch a Flabébé by using Toxic to reduce its mobility. She nicknames it "Fla-chan" and takes it to a Pokémon Center for post-battle treatment.

Her journey with Alain includes significant events in Hoenn involving legendary Pokémon. She observes Primal Groudon and Primal Kyogre clash near a megalith (Giant Rock) and fears for Alain's safety during his battle against them. When Alain is injured, she ignores his prior dismissal of her as a "burden," rushing to physically drag him to safety with aid from Steven's Metagross. This act sparks an emotional reconciliation where Alain thanks her.

A pivotal moment occurs when Alain harshly tells Mairin she hinders his goal to become the strongest trainer. Distraught, she flees while Chespie wanders off and falls critically ill after exposure to a mysterious green light. Chespie enters a comatose state and remains under care at Lysandre Labs, prompting Alain to vow finding a cure.

During the XYZ arc, Mairin attends the Kalos League finals supporting Alain. When Lysandre reveals his plan to destroy the world, she questions his motives regarding Chespie's treatment. After escaping Team Flare grunts with Professor Sycamore's rescue, she joins Sycamore and Serena to retrieve Chespie from Lysandre Labs, navigating attacks from Team Flare admins.

Her known Pokémon include Chespie (Chespin), her primary companion traveling outside its Poké Ball, and Fla-chan (Flabébé), which knows Magical Leaf.