[FEATURE] Allow users to customize the startup screen mascot

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Feature Request: Customizable Startup Mascot

The Claude Code welcome screen shows a cute pixel art robot. I'd love the ability to swap it out with a
custom image!

Proposed options (any would be great):

• A config setting in settings.json pointing to a local image file
• A ~/.claude/mascot.png convention Claude Code checks for automatically
• Any other supported customization path

Why: Personalization makes the tool feel more fun and personal.
As a first use case — I made a custom Claude icon wearing a Cleveland Guardians hat
with a bedazzled C, and I'd love to see it on my startup screen every session. ⚾

<img width="1328" height="800" alt="Image" src="https://github.com/user-attachments/assets/7eb41c37-c40a-4134-b99b-9770166470d0" />

Proposed Solution

Proposed options (any would be great):

• A config setting in settings.json pointing to a local image file
• A ~/.claude/mascot.png convention Claude Code checks for automatically
• Any other supported customization path

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

Why: Personalization makes the tool feel more fun and personal.
As a first use case — I made a custom Claude icon wearing a Cleveland Guardians hat
with a bedazzled C, and I'd love to see it on my startup screen every session