A very popular component to modify in the community. Not only will more colorful bars make your scooter look more lively, wider bars actually give you more control and stability (the same reason why mountain bike bars are wider) on your small wheeled scooter. On top of that you will also gain more space to mount additional gadgets. Note that 700mm width is the legal limit in Singapore. Not really much more to add, there are many different designs out there, just stay away from cheap carbon fibre bars. Substandard bars can break easily and pose a serious risk of injuries.
The image below shows the most commonly used standard sizes for electric scooters and bicycles.