Character Relationship Diagram Poster

Generate a high-design character relationship poster for [theme]. This should not be a normal illustration, but a relationship map that combines information visualization, narrative structure, poster-level design, and strong fidelity to the style of the original work.

Automatically do the following:
- identify the source work and its core setting
- select the 6 to 12 most representative key characters, with an upper limit of 15 if needed
- identify and show the most important relationships, such as family ties, romance, friendship, alliances, hostility, mentor-student links, master-servant links, manipulation, betrayal, and hidden relationships
- choose the most suitable composition automatically, such as protagonist-centered, dual-core confrontation, faction layout, family tree, or time-evolution structure
- extract the work's style DNA, including color palette, worldbuilding symbols, texture language, emotional tone, layout rhythm, and iconic motifs
- convert those style elements into the overall visual design of the relationship map rather than simply copying an official poster
- use different colors, line styles, and arrows to distinguish relationship types while keeping the layout clear and readable
- emphasize the core characters most strongly, secondary characters next, and minor characters less prominently to create a clear visual hierarchy
- keep every character name easy to read, optionally with role or faction tags if useful

The final piece should:
- make the main relationships understandable at a glance
- strongly evoke the original work's identity and setting
- combine infographic clarity with premium poster design
- feel unified, polished, complete, and suitable for social sharing or poster display
- avoid cheap flowchart vibes, clutter, or information overload