Anti-aliasting doesn't seem to affect character models in the character creation, inventory, and level-up screens.
TO REPRODUCE:
Start a new game on a PC whose monitor's native resolution is 2560x1440, and play at that resolution.
At character creation, bring up the console and type "msaa 0" to disable anti-aliasing.
Observe the edges of your character's model and how they are jagged.
Bring up the console once again and type "msaa 16" to apply the heaviest form of anti-aliasing available.
Observe how the edges of your character's model remain unchanged.
The same steps can be reproduced when leveling up and while visualizing your inventory.