Regret

This creature and Fork (another character on my profile) are similar in the nature that no one really knows what they are, Regret takes the shape of a Dinosaur, but when you have angered it it will take shape of anything or anyone its victim loves and has wronged  in the past, Hence the name Regret. When Regret takes the new form of that thing the victim has regret over a wrongdoing of, it will always be in greyscale.