Lavan is extremely power-hungry, believing that power is all that matters and seeking it above all else. He is also violent and cruel, often abusing Sludge and trying to kill the Princess Ponies on more than one occasion. He hates the Ice Orcs, at one point threatening to kill their leader Gnash.
Lavan kidnaps the Princess Ponies and steals their magic wands, since they contain all the magic in Ponyland. He tried to use them to transform himself into an all-powerful crystal being. At first it didn't work, instead upsetting the balance of Pony Land. He then kidnapped the six Princess Ponies (except Princess Tiffany who flew away) and ordered his minions to throw the Princess Ponies into a lava pit, but they escaped. Lavan began his crystal transformation but was informed by his henchman Sludge that they escaped. Lavan attacked him, and later found Spike, the Princess Ponies, and his enemy Gnash, and imprisoned them in the dungeon, from which they were released by Sludge, who was tired of Lavan's abuse.While Lavan's abuse of the wands began turning Pony Land to crystal, Lavan completed his crystal transformation. When the Princess Ponies found the wands, drained of power, Lavan attacked them, but they escaped after Princess Tiffany and Megan arrived. They found the Heart of Pony Land, which was used to recharge the wands, but Lavan attacked them. Sludge knocked him into the lava, from which he re-emerged only to be frozen by Gnash. By the time he broke free, the Princess Ponies had their wands back. Working together, they used their magic to send Lavan's rainbow beam back at him, destroying him.
- Lavan bears slight resemblance in appearance to the slime monster Crud. Their minions, Sludge and Smudge, have similar voices and names as well.
- Lavan is the second My Little Pony villain to unambiguously be destroyed, the first being Tirek. Counting the Smooze, Lavan is the third. (The fates of Hydia, Squirk, and Beezen are unclear)
- His death is similar to that of G4's King Sombra, who turns to crystal and shatters to pieces.
- Of all the My Little Pony characters in G1 and G4 to die, Lavan is the only one whose death is directly alluded to after it happens. Megan says "He's gone" and Princess Primrose says "Lavan is no more".
- Lavan is one of the most evil G1 villains, alongside Tirek, Hydia, Squirk, and Grogar.