Guild Wars 2

Be able to create other character things that are not combat and profession related to add some spice to the game. Things like mobile air, land and underwater things. These things would have their own stats, skins, functionality, control UI, purposes, etc. They could be used in mini games too. They could miniatures that could move around in the open world and go into miniature arenas and other instances to adventure or do whatever. Some select minis could be used and then more to be included.
New character type things of all sorts can be done but that is all for now.

But we already have this functionality through miniatures (“mobile things”) and tonics, just not bound to the character creation screen.

Similarly, it would reduce the unique aspects of each profession if everyone could have a “mobile thing” that has their own stats and functions to contribute in combat (specifically, the Ranger “pets” and Engineer “Turrets” etc would not be unique), and reducing disparity between professions is not a good thing.