Red

First things first: There's Red and... then there are other trainers. My writing will follow Red primarily but, should you prefer to follow someone else, the option is there. And with that out of the way, a brief synopsis:

Red (unaffiliated with Ash Ketchum) is an eighteen year old guy who has decided to give life on the go as a pokemon trainer a try. He's well built and the ladies seem to fine him handsome. Raised in a fairly liberal household, it's time to forge his own way and see the world. And if he should meet some classy girls on his journey, so be it.

Ash is another youngster setting out with only one goal in mind: to be the best there ever was... and subsequently blunder through a bunch of opportunities until he repeats them again next season...

(Feel free to add other trainers as you please. Also, feel free to send Ash through the canonical story or give him some wiser or at least more interesting options. And lastly, every character described in this story is 18+)

Also, in case you didn't realize, this is set in the world of Pokemon. Keep it relevant.