When you start a new game in Code Vein you’ll be asked to customize your appearance before you begin. However, you can customize the look of your character at any time in the game, once you’ve made it to a certain point. After you’ve arrived at the Home Base hub in Code Vein there will be an area in the hub to change your appearance.
Look for the Mirror and Skin in the Home Base to change your appearance
You will find a Mirror and Sink near Coco the Merchant in Code Vein. Interact with the mirror to adjust your appearance. In this section you can change a number of different options much like you could at the start of the game. Things like Skin color, hair, eyes, makeup, accesories, clothing mask and more. But you cannot change your gender once the game begins.
There is no cost associated the changing any of these features about your character and you can change these appearance items multiple times throughout the course of the story.