This tree map visualizes the hierarchical relationships among characters in the "One Piece" anime, using a node-link diagram with color-coded categories. The visualization, built with D3.js v3 and jQuery, presents a branching structure where nodes representing character groups expand into subcategories. Interactive features include zooming, dragging, and tooltips that display additional information on hover. Data is loaded from an external JSON file and rendered as SVG, with CSS styling for node colors, link styles, and tooltip formatting.