|First Appearance||Mario & Luigi: Rivals Quest|
|Latest Appearance||Super Mario Smash Bros.|
|Main Ability/ies|| Dark powers|
Ztar Soul transformation
|Relative(s)||Ztar, Cosmic Dark Stars|
Lord Ztar is the main antagonist in Mario & Luigi: Rivals Quest. A very long time ago in the Mushroom World, he attacked the entire Mushroom Kingdom and other lands to take them over, however, all the habitants and some Mushroom Warriors united forces to defeat him, so his plans failed terribly and got trapped in the far space. Then, he got free and launched his minions, the Cosmic Dark Stars, to help him in hopes of ruling the Mushroom Kingdom.
Lord Ztar is a Ztar of course, however, his body is more ghost-like, instead of being a Star, but still have the white, angry eyes. He also wear a black top hat with a red tape and a blue-ish grey/purple cape with a red pearl in the middle holding the cape, making him look much like a specie of magician. As seen in some sprites, he has something on his back, like a black Star or Ztar symbol at the back of the cape.
When turning into Ztar Soul, his top hat and the cape disappears. He has now one big eye, purple things appear on it and two purple flames surrounding him.
In the beta Ztar Soul Transformation, his top hat and the cape also disappears, but his eyes become bigger and angrier, purple wing-like things appear on them and two purple flames and dark particles surrounding him. He also has a big mouth.
- Lord Ztar have a blue-ish purple cape in-game, but is shown with a blue-ish grey cape in his artwork.
- Lord Ztar's Ztar Soul transformation somewhat resembles Zero from the Kirby series.