Diego first turned into a dinosaur after he, along with a number of villagers, were controlled by Dr. Ferdinand in order to steal the left eye of the Saint's Corpse from Johnny and Gyro.
After Ferdinand was defeated, Diego stole the corpse part and fused it with his left eye, allowing him to retain the ability to turn himself into a dinosaur.[13] While initially benefiting from just enhanced senses and strength, the stand and all of its abilities eventually became his own.[14]
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Scary Mosters:Diego Brando
FanfictionDeep Explanation of the main diego in Steel Ball Run and his stand scary monsters