Feature Request: Allow customizing Companion appearance (e.g. cat, dog, etc.)

Feature Request

Is your feature request related to a problem?
The Companion (buddy) currently only supports a fixed penguin appearance. It would be great to allow users to customize the Companion's look — for example, changing it to a cat, dog, or other characters.

Describe the solution you'd like
Add a setting (e.g. in settings.json or via a slash command) that lets users choose or customize the Companion's appearance/avatar. Options could include:

• Built-in presets (penguin, cat, dog, bunny, etc.)
• Custom image/emoji support

Describe alternatives you've considered
Currently there is no workaround — the Companion appearance is hardcoded.

Additional context
This would make the experience more personal and fun for users who spend a lot of time in Claude Code. 🐱

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Submitted on behalf of a user who would like their 草莓麻糬 to be a cat.