May is a young, tomboyish and energetic Pokémon Coordinator currently traveling through various regions to compete in Pokémon Contests. She started her journey traveling through the Hoenn region accompanying Ash and Brock, along with her little brother Max. On the way to the Grand Fesival, she met Harley and Drew. When Ash and Brock left for Sinnoh, she goes to Johto alone without Max. She appears in a few episodes of Diamond and Pearl: Battle Dimension, where she traveled to Sinnoh to compete in the Wallace Cup. She reappears as a flashback in The Dream Continues.
May has brown hair secured by a red and white kerchief, and blue eyes. She wears a red shirt with a navy blue semi-circle on it, yellow fanny pack, white and navy mittens, short and sleek dark blue bike leggings, white mini-skirt, and black socks along with red sneakers with black and yellow stripes. Her Emerald-based outfit is an orange tunic with white pockets and stripes with a mint fanny pack, green and white kerchief, black collared tank top/vest underneath, the same socks, orange, white and black shoes along with the leggings color changed. May's Wallace Cup outfit is a pearl-pink veil which has a green gem at the top, pink top with saffron borders and heart on the chest area, lilac-purple skirt, saffron-colored necklace with a red heart-shaped gem, pink fabric in her waist, and brown flip-flop shoes with toe rings. In her cosplay as Nurse Joy, she wears a pink mini-dress, white dress coat, a nursing cap with a pink cross, and white Mary Jane flats. In the Diamond and Pearl series, she was shown wearing orange and white pajamas,
At the start of her journey, May didn't like Pokémon, as she wanted to start her journey just so she can visit places. However, her encounter with Ash and Brock changed that. Despite her beauty, May is a kind-hearted person, who would help people in need. Like Misty, she can get very angry at times, with her disagreements with Ash or her brother, Max. However, she can get very sad, especially when she loses a Contest, but does her best to prevail. She is also shown to have a side for romance, though at rare occasions.
She loves cute and pretty Pokémon and flashy techniques, competing in contests and making her own Pokéblock with recipes that she thinks up. "May's Purple Surprise" and "May's Pink Surprise" were such examples, as everyone else rejected them after tasting them, while the only ones who liked her Pink/Purple Surprise are her Munchlax and Jessie.
When May saw a contest battle for the first time, she decided to become a coordinator. She then had to overcome her fear of Bug type Pokémon by raising her Wurmple into a Beautifly.
While Ash and Brock chose to travel to Sinnoh, May decides to follow her rivals to Johto. However, she meets up with Ash, Brock, and Dawn in Sinnoh, wearing a green bandanna like the character Pokémon Emerald, then sometime later participates in the Wallace Cup. Dawn once referred to her as "Princess" which makes the fact that she has an unknown identification believable.
After narrowly losing to Dawn in the Wallace Cup Finals, she leaves the group to continue her journey in Johto.
She would use her Combusken's Fire Spin and her Squirtle's Bubble to create a combination of Fire and Water. Which was dubbed by Lillian's Medichan as a Fire and Water Whirlwind. She was able to knock-out Drew's Flygon and his Absol. During her journey she won numerous ribbons in both Hoenn and Kanto and she is still using those skills and talents in Johto currently. But May did reappear during the Sinnoh saga in four episodes meeting Ash, Pikachu, Brock, Dawn and Zoey for the Wallace Cup. May also has a personal ending theme song called I Won't Lose also called Haruka's theme in Japan in two episodes of the Pokémon anime's Kanto Battle Frontier saga the theme was used as background music in Curbing the Crimson Tide! and again in the next episode What I Did For Love!. It was also used during the Sinnoh Wallace Cup saga.
Blaziken was given to May by Professor Birch in Littleroot Town when it was still a Torchic. She chose it as her starter Pokémon because she thought Treecko was creepy and scary (though she later called them cute in Trees a Crowd), while the starter Mudkip had attacked her earlier with a Water Gun to the face. As a Torchic, it evolved in the episode A Shroomish Skirmish, when trying to fend off some Shroomish and Breloom. It later evolved in the midst of a Pokémon battle with Team Rocket.
May was kidnapped by a Skarmory and ended getting lost in a place called the Forbidden Forest, which is a preserve for Grass-type Pokémon. Then May met a clumsy Bulbasaur trying to pick flowers. It eventually evolved in a Ivysaur and much later it evolved into a Venusaur.
After May left Skitty and Beautifly in Hoenn, she met Ash in Pallet Town and one of Oak's Squirtles seemed to take a liking to her. Professor Oak allowed May to have the Squirtle and travelled in her Poké Ball.
After Birch was attacked by a Poochyena, he asked May to send out one of the Starter Pokemon. May then sent out Mudkip, but was unable to command it. Later, it drenched May with a Water Gun attack. This was the reason she didn't choose Mudkip as her Starter.
After May saved the Manaphy egg in Pokémon Ranger and the Temple of the Sea, it hatched and imprinted on May and thought she was its mother. It had such a close bond with May, it began learning words and even learn May's name. But it knew it had to leave and protect Samiya, the Sea Temple, even though it did not want to leave her side. Leaving her behind, it left with a few words including "love" and "you".
German: Nicola Grupe, Stephanie Kellner (Movie 6 and 7)
Italian: Serena Clerici
Filipino: Charmaine Cordoviz
Czech: Klara Sumanova
Portuguese: Carla (Season 6-8), Isabel Ribas (Season 9), Marta Mota (Season 11)
Mandarin: Fu Manjun
Danish: Annevig Schlede-Ebbe
Brazilian Portuguese: Tatiane Keplmair
Iberian Spanish: Ana Lobo, Liliana Barba, Mariana Ortiz, Agustina Priscila
Thai: Arunee Nuntiwass
Hebrew: Dawn Lanny-Gabay
Like Misty, May is last seen leaving the group and returning to her respective journey, with no mention or future appearance in the series.
May was the only character to give a personal narration of her introduction in the series.
In seasons 6-8, May and Ash shared the same voice actress: Veronica Taylor. And in season 9, Misty, May and Jessie shared the same voice actress: Michele Knotz.
May has owned two Pokémon and befriended one Legendary Pokémon from the fourth generation: Munchlax, Glaceon (can only evolve from Eevee in Sinnoh), and she had befriended a Manaphy, a Mythical Pokémon.