Trainer

The Trainer is the main player avatar in Magikarp Jump.

Summary
As the name implies, not much information exists about this character, other than its' design being inspired by Red from the original Pokemon games.

Another thing worth noting is that they don't really have a gender (as the Man of Mystery stated) nor personality. This was probably due to not needing one for the game they're in and for a better reflexion of the player.