Rocky prided himself as the strongest member of Thirteen's Monster Party.
When he first met his Master, he was only seven years old.
Back then, he only followed the young boy because of Tiona, who could dominate snake-type monsters regardless of their form.
Rocky was a Rock Snake and spent most of his time deep underground.
But after that fateful encounter, he found himself mixed in all sorts of troubles.
Originally, he only planned to pay lip service to the human boy because he didn't deem him worthy to become his Master.
However, the more he spent time with Thirteen, the more he realized that the human boy wasn't normal.
No, he was abnormal.
A seven-year-old dared to scheme against a Majin Prince?
Not only was it a suicidal move, but it was also plain crazy.