Being able to create something unique, to be able to set yourself apart from the crowd is what character diversity is about. It can be a unique look, playstyle or story but, it also means much more than that. Depending on how the game allows you to put your spin on something it can often lead to something more than a personal creation. If you are allowed to make choices in a story, it can lead to excellent dialogue between players when discussing the specifics. Allowing a player to tweak how there character performs allows the spreadsheet masters to create something they are satisfied with and allows them to discuss the different ways a character can be optimal. Even a certain playstyle can shed light on something you never would have experienced with the way you play. Guild Wars 2 allows players to do all of the above.
Obviously, the first step in character diversity is creating a character. As you know there are five races to choose from, each has their own special characteristics. You will be able to choose the fur pattern of a Charr character while the Norn allows you access to unique body tattoos. Along with this, you also get all the bells and whistles. You can select body type, hair, face type, facial features, and dyeing your starter gear.
Aside from a unique look that allows you to create a bond with that character there are also a number of professions to choose from that dictate how you play. There are eight professions in the game and they range from the powerhouse Warrior, the protective Guardian to the Mesmer, an illusion specialist. Each class has something that sets them apart e.g., the Mesmer creating illusions, a Necromancer using pets and death shroud, the Engineer using a variety of gadgets including turrets.