Azazel.exe
Azazel is the first core guardian, And the first major boss of pony island. Azazel.exe or Azazel for short is a daemon, with his other daemon comrades, he and Beelzebub get into fights daily.
Azazel.exe also has full control of your computer, making you use your brain to defeat him. He has his own cursor and communicates with a keypad. He's the only one who can't directly "Kill" anyone, he has shown to also have good manipulation and deceiving skills and has control of code chains.