Underwater Cartoon Barbarian Adventure

A cartoon-style barbarian underwater: a burly, cheerful hero with a goofy grin, shaggy hair, and a torn fur cloak over rugged leather armor. He wields a large bronze axe, water bubbles trailing as he swims through a vivid coral reef. The scene is bright and playful with thick black outlines and bold, cel-shaded colors reminiscent of classic 2D cartoons. Surrounding him are curious tropical fish, a friendly octopus, swaying kelp, and sunbeams piercing the blue water, creating dramatic light caustics and bubbles. Include playful details like a treasure chest half-buried in the sand and dynamic motion lines to emphasize action. The mood is adventurous, humorous, and kid-friendly, with a visually striking, whimsical style.