What is the thing that have different of shape and colours at their body?

It is an animal that we call as Starfish or else Sea star , they are echinoderms belonging to the class Asteroidea.

 this animal is the most familiar among other marine life, for broadly speaking this animal are opportunistic feeder with several species have specialized feeding behavior such as suspension feeding and specialized predation on specific prey.
The group of starfish or sea star has their own relatives such as the sea cucumber, and irregular sea urchins, and regular sea urchins.