The Diamond Pig is the main antagonist of the ExplodingTNT video, "If a Diamond Dimension was Added - Minecraft". The pig at first is kind and hospitable to the first player to enter its dimension, but later will not let him leave unless he gets it a golden carrot, which is impossible to get in a diamond dimension.
The video starts with the player discovering the newly added Diamond Dimension, where everything is made of diamond. The pig comes to greet him, but is killed by the player for its diamond pork chops. The player explores a bit and returns to find that the pig respawned and tuned off his portal home, telling him the only way back was if he gave it a golden carrot. The player tries to find one, but is unsuccessful. The player soon finds a way to turn the portal back on and tries to leave, but the pig keeps shutting it off before he can travel. This continues for twelve hours until two diamond dragons destroy both the player and the pig for disturbing them.
The Diamond Pig looks like a normal Minecraft pig, but with the light blue texture usually seen in diamond blocks.