Understanding the principles of animation in general—like timing, spacing, anticipation, and squash-and-stretch—will apply to 3D animation specifically, as will a knack for drawing, visual composition, color, and design.
Additional artistic and soft skills will also help. Understanding the principles of animation in general—like timing, spacing, anticipation, and squash-and-stretch—will apply to 3D animation specifically, as will a knack for drawing, visual composition, color, and design. Attention to detail and soft skills like problem-solving and good team communication are also important.