You can’t customize the Mantis in Star Wars Jedi: Survivor.
Open the menu, click the Customization tab, and select Customize Cal.
From here, you can choose different hairstyles, facial hair, and change the appearance and color of Cal's clothes.
You can use Workbenches to customize your lightsaber, blaster, and BD-1.
You can find Workbenches throughout the game and inside your ship. When you find one, open the Workbench menu and choose what you want to customize.
Open the Workbench menu and choose your lightsaber.
Click the Components button to personalize the components of your lightsaber.
Click the Blade button to change the color of your lightsaber's blade. You can unlock more colors further in the game.
Click the Materials button to change your lightsaber's materials and polish.
Open the Workbench menu and choose your blaster.
Click the Components button to personalize the body, barrel, and grip of your weapon.
Click the Materials button to change the material of each component.
Open the Workbench menu and choose BD-1.
Use the menu to choose which section of BD-1 you want to change. You can personalize his photoreceptors, head, body, legs, materials, and condition.