「NightOwl」は FontVibe AI で作成したレインボーの文字エフェクトです。鮮やかな多色レインボーグラデーションの文字エフェクトです。滑らかな色の移り変わり、プリズムのような光、そして陽気で色彩豊かなタイポグラフィが特徴です。

rendered as rainbow text effect — COLOR (mandatory): each individual letter must contain a complete ROYGBIV rainbow gradient top-to-bottom within itself — top=red, upper=orange, mid=yellow-green, lower=blue-indigo, bottom=violet. NOT one color per letter. NOT a gradient across the whole word. Every letter is its own complete rainbow. Full chroma Pride flag saturation — not pastel, not muted, not shifted to any single hue. YouTube search results page mockup in browser: multiple video thumbnails in a grid. One thumbnail is highlighted/enlarged — it features 'NightOwl' in rainbow balloon letters as the channel name, clearly standing out from surrounding thumbnails. The vivid ROYGBIV rainbow text contrast against other thumbnails shows why rainbow text improves thumbnail CTR. Thumbnail comparison showing rainbow text advantage in search feed.