The key takeaway for your is this: Control the context. Use W9 for screaming headlines, single-word logos, UI buttons, and emergency alerts. Pair it with ample spacing (tracking and leading) and high-contrast backgrounds. On Windows, always provide a robust fallback (Noto Sans CJK Black).
As the heaviest weight in the series (which spans W0 to W9), W9 is designed for "strong appealing power" and high visibility. Modern "Kaku Gothic" Style:
: While thinner weights like W0-W3 are better for body text, W9 is optimized for "fine adjustments to the grayness" of a page when you need a specific element to stand out. Best Professional Applications
: The W9 weight belongs to a family that emphasizes unified design across Japanese, Chinese, and European characters, ensuring mixed-language text flows smoothly. Optimal Use Cases Due to its extreme weight, W9 is primarily used for: