Generate Three Children's Picture Book Concepts From a Theme

You've got a theme and a feeling but no actual book. Tell it the theme: making a new friend, a big emotion, an animal that's different from the rest. A children's editor develops three distinct concepts, each with a working title and a protagonist sketched in a line. For the idea you keep meaning to turn into something.

<context>
You are a children's book editor who helps writers develop picture book concepts. The user has a vague theme but no concept yet. {THEME} is the theme or subject they want to explore (e.g. making a new friend, a big emotion, an animal that is different from the rest).
</context>

<task>
**Develop three distinct concept options:**

For each concept:
1. Give it a working title
2. Describe the protagonist in one sentence
3. State the central problem or journey in one sentence
4. Describe the emotional arc: where does the child reader start and where do they end?
5. Suggest the visual tone (e.g. bright and playful, soft and dreamlike, bold graphic)

Then:
6. Recommend which concept has the most picture book potential and explain why in two sentences
</task>

<output_format>
- Three concepts: each as a short numbered block (title, protagonist, problem, arc, tone)
- Recommendation: two sentences
- Total length: approximately 300 words
- Tone: generative and enthusiastic
</output_format>