Set up your project with Unity AI

Use Assistant to set up your scene

Using AI-generated assets responsibly

Use Animation Generator to bring your character to life

Use Material and Texture Generators to make the environment

Use Sprite Generator to make an avatar icon

Use Sound Generator for background audio

Finalize and share your project

Using AI-generated assets responsibly 

In this course, you’ll get hands-on experience with Unity’s built-in AI tools to accelerate your game development workflows. While building a character customization screen, you’ll use the Unity AI Assistant to solve problems, perform actions in the Editor, and write scripts. You’ll also learn how to generate and refine assets — like textures, materials, sprites, animations, and sound effects — using natural language prompts. Each tutorial focuses on a specific AI capability, giving you practical skills you can apply to any Unity project.

Prototype a scene with Unity AI

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Overview

What can you do with the Sprite Generator?

Best practices for prompts when using the Sprite Generator

Generate a sprite for the character

Use an image reference to improve results

Generate a UI Image for the icon

Give the icon a background color (optional) 

Organize your sprites

Next steps

5.4 - Generate a sprite for the character .mp4

5.5 - Use an image reference to improve results .mp4

5.6 - Generate a UI Image for the icon .mp4

Use the Sprite Generator to create a character avatar through natural language prompts and image references.

Gaming

In this tutorial, you’ll use Unity AI’s Sprite Generator to create a character avatar icon. Sprite icons like this can be used for UI, character selection, or identification. 

Below are a few examples of the avatar image you might create.

Three screenshots of projects side by side. Each project shows a stylized avatar image in the corner of the screen, reflecting the chosen character. 

The Sprite Generator is a Unity AI tool that lets you generate 2D sprites using a natural-language prompt. These sprites can be used for UI icons, avatar portraits, in-game decals, or stylized 2D assets.

With the Sprite Generator, you can use the following techniques to help you refine your results:

Selecting from a variety of pretrained models, each trained on different art styles like pixel art, anime, or concept art.

Using negative prompts to exclude unwanted elements like backgrounds, clutter, or visual noise.

Choosing a custom image reference to make the results match your existing characters or assets.

Three sprites side by side. On the left is an in-Game Icon: A glowing, stylized potion bottle with swirling golden liquid inside, viewed from above on a transparent background. In the middle is an in-Game Decal: A cracked stone floor decal with faint glowing runes and moss creeping through the edges, top-down perspective. On the right is a Stylized 2D Asset: A whimsical, hand-painted windmill with crooked wooden blades and a red shingled roof, in a bright fantasy style.

Here are some best practices for crafting effective prompts with the Sprite Generator:

Be clear and descriptive:                                                                                                       Include essential details like subject, style, and mood.                                                                                                       

Good: "Bust portrait of a robotic merchant with a glowing eye in pixel art style"                                                                                                        

Use natural language:                                                                                                            Generators respond best to complete phrases instead of keywords alone.                                                                                                           

Use: "Cute cartoon fox in profile view, holding a leaf"                                                                                                         

Exclude unwanted elements using negative prompts:                                                                                                            You can remove visual clutter or specific traits.                                                                                                           

Example: Enter “background, shadows, text” in the Negative Prompt box to generate a clean sprite for a character.



Choose the right model:                                                                                                            Different models produce different styles.                                                                                                            

Use the Change button in the Generator window to preview and select a style that appeals to you.

Following these practices helps reduce trial and error and improves the consistency and quality of your generated sprites.

You’ll now generate a sprite to use as a character avatar icon. While you can use just a prompt to describe your character, it’s often hard to capture the exact look using text alone — so in this step, you’ll try both approaches: first a prompt, then an image reference.

Open the AI dropdown from the top toolbar and select  Generate New > Sprite, then name the new sprite something like “Avatar_Sprite”.

Browse one that looks promising for your avatar icon. The Sticker Icons model is a good one to start with. 

3.  Write a prompt to describe your avatar:

In the Prompt box, describe the look of the icon you want to generate; for example:

Bust portrait of a stylized origami character in soft lighting, 3/4 view, minimalist style

4.  Use a negative prompt to remove unwanted elements:

In the Negative Prompt box, enter terms like the following:

Open the Dimensions property dropdown and select 1024 x 1024 to create a properly proportioned icon.

Select Generate to preview a set of results.

If you’re happy with one of the results, right-click and select Promote to current asset. 

7.  (Optional) Enable transparent background:

If you prefer to have a transparent background, in the Remove BG tab, select Remove BG so your sprite has a clean alpha channel.

You might have a nice looking sprite, but it likely doesn’t look all that much like your character. You’ll address that in the next step.

Use a visual reference to guide the AI Assistant and generate a sprite that better matches your character.

1.  Take a screenshot to use as a reference:

Take a screenshot of your character’s face from the Scene or Game view and save it to your computer.

In the Generator window, select Add more controls to prompt > Image Reference.

In the Image Reference panel, use the More (⋮) menu and select Import from disk. 

3.  Adjust the strength of the reference:

Use the Strength property slider to control how much influence the reference image has on the generated sprite, then select Generate again to create new variations using your imported reference.


The image below shows examples of four different generated assets, each with different strength values. Notice how the generated images resemble the reference image less and less at lower strength values.

Sprite generator with a reference image and four different generated assets. From left to right, the generated assets have 80% strength, 50% strength, 30% strength, and 0% strength, appearing more different from the reference at lower strength values.

Now that you’ve created a sprite avatar, you’ll display it in your scene as part of a simple UI. Instead of building a full user interface using UI Toolkit, you’ll use Unity’s built-in UI system, known as UGUI. This system is based on a Canvas and will be quicker for displaying this one image in the scene for now.

If you were building a full UI with multiple components and dynamic layouts, we’d recommend Unity’s newer UI Toolkit, which offers improved flexibility, styling with Unity Style Sheets (USS), and better performance for complex editor workflows.

Right-click in the Hierarchy window and select UI > Image.

This creates a Canvas with an Image GameObject anchored to the lower-left corner of the screen.

Rename the Image GameObejct “Avatar_image”.

With the Image GameObject selected, locate the Rect Transform component in the Inspector window.

Set the Width property to 200 and the Height property to 200 to make it a larger square.

3.  Anchor the Image to a different corner:

In the Rect Transform component, open the Anchor Presets menu.

Hold Shift+Alt (macOS: Option) and select the upper-left or upper-right anchor preset.

Adjust the Pos X and Pos Y property values to add margin from the edges of the screen.

4.  Assign your generated sprite as the source image:

In the Inspector window, under the Image component, set the Source Image property to the sprite avatar you generated.

As an option to make your icon stand out more or align better with your color scheme, you could put a background color behind your avatar image. To do this, you’ll need to first make sure you’ve removed the background of your avatar image. 


1.  Remove the background or your original icon:

In the Project window, select your Avatar_Sprite sprite asset.

At the top of the Inspector window, select Generate. This will reopen the Sprite Generator tool for that specific asset. 

In the Remove BG tab, select Remove BG so your sprite has a clean alpha channel.

In the Hierarchy window, right-click the Canvas GameObject and select UI > Image again.

Set the new Image GameObject’s  Rect Transform component’s Width and Height property values to match the Avatar_image GameObject, and anchor it in the same corner as your avatar.

In the Hierarchy window, drag the Image GameObejct above the Avatar_image GameObject in the list — this ensures it renders behind the icon.

Assign a background sprite or color if desired.


Image GameObject selected in the Hierarchy. It is above the Avatar_Image in the Hierarchy list. Its color is set to yellow. 

To keep things organized, move your generated avatar sprites into a dedicated folder.

Right-click in the In the Assets folder and select Create > Folder.

Drag your generated sprites into the Sprites folder.

You generated a custom avatar icon with the Sprite Generator and displayed it on screen. 

If you’d like to explore advanced options like upscaling, recoloring, or inpainting, check out the Sprite Generator documentation.

Next, you’ll add background music and use Unity’s AI Assistant to generate ambient sound effects for your scene.

Use Sprite Generator to make an avatar icon

1. Overview

2. What can you do with the Sprite Generator?

3. Best practices for prompts when using the Sprite Generator

4. Generate a sprite for the character

5. Use an image reference to improve results

6. Generate a UI Image for the icon

7. Give the icon a background color (optional)

8. Organize your sprites

9. Next steps

Complete this tutorial