So with some of the teaser images, it's suggested that we might have a wide range of sliders with The Sims 4, with things like height, arm length, arm thickness, hips, etc. This is good, because being able to create a sim that's uniquely yours is important, but my only concern is how limiting will it be? For example, Late Night introduced bust sliders to the CAS, but it seems like the size stops off at DD(unless you mod, and then they don't even look right), so I think with these sliders there should be a much larger range of sizes to work with, not just bust, but with everything else.
In the real world, people come in a gigantic range of shapes and sizes, rather than a set frame with slight variables, and I think that should be the same for the Sims. If limitations are set, they should only be done within reason, but we should be able to make our sims essentially as small or as big as we want. It might be entertaining to have a tall, anorexic sim, or a short obese one, or any mix inbetween.
I think games like Phantasy Star 2, Star Trek Online, and Saints Row the Third really set a good standard for character creation, and while they weren't perfect, they were steps in the right direction. So what could The Sims 4 do to make their game have the best character creation system?
The Body Triangle: This should be the basis for character physique between fat, skinny, and muscular. If you set the weight and muscle definition slider to max on the Sims 3, it looked silly. A Triangle prevents this from happening.
The Body Sliders:
Height
Shoulder Width
Shoulder Bulk
Arm Length
Arm Thickness
Arm Ratio(The balance between upper and forearm)
Hand Size
Hand Thickness
Finger Length
Torso Length
Torso Thickness
Bust
Bust Shape(This could possibly operate on a square scale, rather than a slider. Up and Down could be Fullness, and Left and Right could be Perkiness)
Waist
Stomach
Hips
Pelvis(The male answer to the female bust. Lets face it, sim men are basically neutered.)
Posterior
Leg Length
Leg Thickness
Leg Ratio(Same as Arm Ratio)
Feet size
Feet Thickness
Toe Length
The completing factor would be jiggle physics. Go ahead and have your giggle. Done? Lets face it, the human body moves in more ways than 1, and everything isn't neatly fixed into place. So a sim with a big stomach(or yes, big breasts), might have that part moving around when they're running. It's the basic squash and stretch physics that the real world operates under.
All of these things should be able to be implemented, and shouldn't have a drastic effect on the games rating.