Everything that Masterpiece sees inspires him to make magical colors. Blue, red, yellow, green, purple, orange and pink, each color gives him the idea for an incredibly magnificent rainbow, and he is consumed with making colors until he is done. Since he doesn't have to carry a watercolor painting with himself everywhere he goes, this leads to him making colors on whatever surface happens to be serviceable though. Masterpiece mixes any magical colors into magenta, scarlet, gold, lime, emerald, teal, turquoise, violet, primrose, fuchsia and any color that he can mix. Any Psymonster thinks it might get him in trouble, but his imaginative and artistic creations are so stupendous and picturesque that anyone never seems to mind.
He is a black monkey with brown eyes, a tan face, a belly, ears, and hands, a green vest, a sleeveless blue shirt, purple pants, a yellow hat with an orange star, and red slippers.
- The name "Masterpiece" means a work of outstanding artistry, skill, or workmanship.
- Masterpiece is one of the eight Magic Psymonsters as animals (the other seven are Egyptian, Colorjack, Hypnodon, Setharina, Thunderhorn, Momentarium, and Honeymoment).