(治性セレナ Naosaga Serena)
|Hometown:||Asame Town (formerly)|
|Voice actor:||Mayuki Makiguchi (Japanese)|
Haven Paschall (English)
|Debut:||XY001: Kalos, Where Dreams and Adventures Begin!|
She is a trainer from the Kalos Region in Japan. Her outfit resembles a Japanese girls' school uniform.
She now currently lives in Ōmiya-ku, Saitama-shi, Saitama-ken, Japan.
- Japanese: 牧口真幸 Mayuki Makiguchi
- English: Haven Paschall
- Italian: Deborah Morese
- Spanish: Isacha Mengíbar
- Her surname in Japanese 治 (なお) means calm and 性 (さが) means nature.
- It took seven (7) episodes for Serena to join Ash in his adventures. This is the longest time it has taken for a traveling companion to join Ash.
- Serena is the first female traveling companion of Ash to not get her or her bike shocked by Pikachu.
- Serena is the first character to be invited by Ash to join him on his adventures.
- Serena is the first of all of Ash's friends to meet him prior to joining him on his adventures.
- Serena is a fan of the anime character Saitama from One Punch Man, albeit residing in Saitama.