Creativity, patience, and stamina are the most important traits of a competent video animator. A competent video animator uses form, motion, color, and a variety of artistic approaches to narrative to be innovative. It takes patience to write a tale in a set amount of time without skipping any essential plot beats. And it takes endurance to maintain your eyes on the computer for hours at a time while you apply the finishing touches or sleep to mend your tired and painful back.
It's also crucial for a skilled video animator to have a great visual imagination, both in terms of how they generate visuals digitally using light software like Adobe After Effects and in terms of how they make animations in general.