three chibi superheroes, sentai style team, 2.5 heads tall, center character red, left character blue, right character green, Japanese style, clean and simple design, cute but professional, poster illustration, white background center (red): confident pose, slightly forward, gentle expression, protecting pose left (blue): calm and cool, holding a small dumbbell, light action pose right (green): relaxed and kind, holding a pillow and wearing a nightcap, peaceful pose all characters: soft glow effect, minimal details, smooth lines, flat color, high contrast, easy to understand at a glance, no clutter, medical and educational poster style, friendly and positive feeling composition: triangular arrangement, protecting something in the center (empty space for heart), balanced layout, simple background