Serena.

The blonde haired main female character of the pokemon X and Y anime and games (note the games Serena is quite different to the animes and in both cases she is 16-17-18 years old in these stories (whatever the legal age in your country is)). Serena on her travels around the Kalos region is either travelling alone with her four other friends she meets with occasionally (games) or with ash and his friends (anime). In my path below this is games Serena, but if anyone wants to continue at some point their own story just specify what version of Serena you are going with for clarity. But moving on Serena is a humble trainer from a rural town and is on her journey around Kalos, but the region is rough and as beautiful as it can be, the true beauty is what is hiding under her clothes that soon won't be any kind of secret.