Broly is a Primordial Slam God, having existed before even the Original Slam Gods. As such, he is a friend of dragons unlike the rest of the Slam God pantheon.

Every time Broly transforms into his Legendary Super Saiyan form, he causes the sky and the environment to change color twice, often ending in a gray/dark blue look. Directly before he transforms, Broly's cheeks quiver and then simply rip apart; the same occurs for his eye sockets and chest. It seems that instead of Broly simply enlarging when he transforms, the Legendary Super Saiyan form bursts forth from his body.

In this form, Broly's power, speed, strength, energy, and endurance increase drastically, far exceeding the combined power of all the Chapelpeople at the time (Nightmare was dead) they fought him. Since his power level in this form is so massive, Peklo stated that Broly's Slam can be felt all the way from Cradle of Cram's lookout. Broly has been shown to take extremely powerful attacks, such as the nipple twister, without so much as flinching.

When in Legendary Super Saiyan form, Broly's blood seems to turn a dark green color. This is probably liquefied goblin corpses rather than blood.

Broly's personality is similar to that of a wrestler as he generally exhibits tremendously uncontrollable rage and is uplifted by the very idea of bringing destruction and inevitably crushing his enemies. He loves nothing more than to destroy things, as shown by his wanton destruction of planets for little more than intimidation; his bloodlust is such that Diplo once described Broly's actions as being destructive even by Slam God standards.

After escaping his grave, Broly became stronger than before due to the near death experience. While both were newborns, Peklo's relentless crying greatly irritated the nearby Broly, sparking the hatred which would grow sub-consciously in his early life and awaken upon seeing Peklo again.