As for the one we saw in the game, it was a small pineapple, also called Diablo.

The combination of seven demons = Big Diablo Seven demons represent the various forces of Big Diablo respectively.

Among them, small pineapple = big pineapple's will has not forgotten the habit of doing things everywhere even if its strength is scattered.

As for the king of hatred, Mephistopheles, the king of destruction, Baal, the king of fear, and Diablo (Little Pineapple) are the strongest and best connected among the seven demons. They are called the inferior three demons, because they are all the products of Diablo's division, so they are all brothers.