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Create a bold Japanese logo on a clean light gray background for a fictional racing-themed eel character brand. The main text should be large stylized katakana/kanji reading {argument name="main logo text" default="ウナ娘"}, with a smaller subtitle banner below reading {argument name="subtitle text" default="ヌルヌルダービー"}. Integrate exactly 2 eel illustrations into the lettering: one dark navy eel curling over the top left of the first character with a cute smiling face and pale belly markings, and one second eel forming a sweeping curl around the right side of the final character. Use a vivid aquatic palette with deep cobalt blue, electric blue, cyan, teal, white highlights, and metallic gold edging. The lettering should have thick white inner borders, gold outer trim, subtle drop shadows, and a glossy high-energy arcade mascot style. Add dynamic water splash effects around the bottom left and lower right, flowing wave ribbons beneath the text, exactly 6 gold star-shaped sparkles scattered around the logo, and exactly 4 small blue diamond-like sparkle accents near the center and top. Behind the subtitle, include a blue-and-white checkered racing flag pattern stretching horizontally. The overall composition should feel playful, premium, and fast-paced, combining marine motifs with horse-racing or derby energy, rendered as crisp vector-like logo art with polished gradients and strong sticker-style outlines.