Generate a detailed image of a youthful, athletic, anthropomorphic kangaroo dressed in boxing shorts. The kangaroo should exemplify strength and possess a determined attitude, showcasing an expression or posture indicative of readiness for a fight. The design should be reminiscent of early Japanese animated styles, capturing their traditional bold lines and dynamic movement. However, the image must not contain any text.

create a detailed image of a young anthropomorphic kangaroo in boxing shorts. Drawn in a style that is characteristic of early Japanese animations. The kangaroo should look athletic and strong. Must have an expression or posture that indicates he is ready to fight.