"I will stand above that flock of pigeons and I will control them." - Diego Brando (Diego Burando , ディエゴ・ブランド)
Scary Monsters is the Stand of Diego Brando , It comes from JoJo's Bizarre Adventure: Steel Ball Run. The way Diego Brando got Scary Monsters was through The Saint's Left Eye (Part of the Holy Corpse).
When Diego isn't fully transformed into a dinosaur, he has a dinosaur tail out. When Diego is fully transformed, he resembles a Utah-raptor with the word DIO striped all around him. It has horns on his head similar to a mohawk design. The colors are mainly light and dark blue. The way Scary Monsters works is that who ever it touches, can be turned into a dinosaur that follows Diego's commands. Diego can also control people through simple contact with the person.