Ludo is a major antagonist of Star vs. the Forces of Evil. In season 1, he uses an army of monsters in order to steal Star's wand and take over the universe. As of season 2, however, he has his own wand and new monster followers. Toward the end of season 2, his body is possessed by Toffee.
Ludo is a short, grayish-green bird-like monster. His head is round, having some bumps and warts on it. He has yellow eyes, and a dark gray beak with sharp white fangs. He wears a mossy green cloak, and he wears an unidentified creature's skull on his head like a crown. Under his skull crown is a light blue patch with a dark green fringe circling it that resembles a kappa's water dish. He wears flip-flops under his cloak.
During the events of "Ludo in the Wild", his appearance changes completely, having lost his castle and minions. He grows a thick gray beard braided into three tails and wears a yellow chip bag after taming a giant spider.
In "The Hard Way" and "Starcrushed", Ludo gains glowing green eyes while Toffee is in possession of his body. In the latter episode, Toffee's arm regrows over Ludo's right arm and the skeletal arm of Ludo's wand, with the wand's crystal fragment embedded in the palm.
Ludo is evil, and bent on stealing Star's wand so that he can take over the universe with it. He is very power-hungry, and he leads an entire army of other evil monsters that are out to help him steal the wand. Self-centered, he puts his needs above those of his minions' and doesn't show compassion if they or anyone around him gets hurt. Despite his evil personality, he is shown to be quite cowardly, childish, and weak, having his minions fight for him (never engaging in combat personally), and often giving up on a fight and retreating after Star and Marco defeat his minions.
When he is forced to fend for himself, Ludo develops great determination, besting a giant spider in battle through sheer cunning and bringing both it and a giant eagle that had assaulted him earlier into his service. He even sheds his former cowardice, allowing a bar full of rats to attack him in order to make him angry enough to charge his wand. He also shows some degree of care for his new minions, telling the spider and eagle to run just before he unleashes the power of his charged wand on the rats.
Ludo despises Star, desiring to get her wand, and constantly annoyed that she always defeats him and his army. He doesn't like it whenever she undermines his power or calls him out for making stupid plans. When he tries to team up with her to deal with Toffee, it is only for his own benefit, and he tries to take her wand whenever he sees an opening. After the wand (along with Ludo's Castle) is destroyed, he vows revenge on Star before she throws him into another dimension.
As Star immediately recognizes Ludo and addresses him by name in "Star Comes to Earth", that would mean they have either fought once before or Star was familiar enough with his misdeeds to consider him an enemy.
When Marco helps Star fight his minions off in "Star Comes to Earth", Ludo is displeased that Star isn't unguarded like he had originally been told. Although feeling more hatred towards Star, Ludo doesn't like Marco and considers him a threat. However, "Storm the Castle" shows that he never bothered to learn Marco's name, as he displays no recognition when Star mentions him, saying "I don't know who that is" (though he did refer to Marco by name in "By the Book", showing that he has since managed to learn his name).
Ludo puts great trust in his army of monsters to defeat Star, but he gets easily irritated with them whenever they fail or act cowardly and wimpy. He doesn't show any compassion towards them, like thinking Beard Deer is being a baby about bleeding internally, makes them do all the work, and insults them when they invariably lose. Ultimately, Ludo's terrible treatment of his army allowed Toffee to convince them to turn on him, and appoint Toffee as their new leader.
Buff Frog is Ludo's most loyal minion. In return, Ludo holds Buff Frog in slightly higher regard than the other monsters, even showing regret when Toffee convinced him to fire Buff Frog. He later tries to convince Buff Frog to work with him in reclaiming his castle by bringing him a sack full of tadpoles to be a father to, and offering his friendship. However, when Star comes along, Ludo callously abandons Buff Frog, telling him he was only pretending. Despite this, he tries to convince Buff Frog to get Star's wand when she is about to attack Toffee, telling him it is "[their] chance", and acting surprised when Buff Frog ignores him.
In "Is Mystery", Ludo still bears some resentment toward Buff Frog, expressing a desire to let him die; he only decides to put Buff Frog to use as one of his workers at the encouragement of his magic wand. However, this only results in getting himself knocked out, as Buff Frog is convinced that Ludo has lost his mind.
At first, Ludo is greatly impressed by Toffee, finding his professionalism and clever strategies a welcome change from his dim-witted followers. Toffee manages to easily manipulate him because of this, as evidenced when he talks him into firing Buff Frog. Ludo realizes too late that Toffee is just using him, losing the loyalty of his army due to Toffee's machinations, and being thrown out of his own castle by him. From that point on, he hates Toffee, and becomes determined to get his castle and army back from him. Toffee then continues to manipulate Ludo while trapped in the wand and tricked him into letting him possess his body.
Ludo and Brittney have had limited interaction, but they have one thing in common: an extreme hatred for Star Butterfly, as shown in "Brittney's Party". Ludo even called Brittney "so nice" for expressing hope that he would destroy Star.
When Ludo first encountered these creatures, he found himself terrified and at their mercy. In time, however, he managed to overcome them individually and press both of them into his service. While he is generally uncaring and tyrannical towards them, he does show a slight level of care for the two, referring to them as "girls" in a tone of familiarity, and even telling them to run just before he unleashed the power of his wand on the bar rats.
After stealing the Magic Instruction Book, Ludo accepts tutelage from Glossaryck, and quickly takes to him as a father figure, to the point where Glossaryck is unnerved by his affection. However, after being manipulated by his wand, Ludo comes to distrust Glossaryck, believing that he is keeping important information from him.
Ludo experienced a very negligent and abusive upbringing. Whenever he speaks of his parents, he does so in a bitter, dismissive tone, and feels little love for his many siblings, at least one of whom had bullied him in their youth. According to Ludo's father Brudo in "Face the Music", Ludo was the runt of his family, and his parents were extra tough on him to toughen him up. However, this bore negative developmental issues in Ludo that resulted in him taking over the family castle. The only family member that Ludo feels any affection for at all is his younger brother Dennis, warming slightly when Queen Butterfly mentions him in "Starcrushed".
- Star Comes to Earth
- Match Maker
- Cheer up Star
- Quest Buy
- Brittney's Party
- Lobster Claws
- Fortune Cookies
- Freeze Day (cameo)
- Mewnipendance Day
- Marco Grows a Beard
- Storm the Castle
- Ludo in the Wild
- Wand to Wand
- On the Job
- By the Book
- Is Mystery
- Bon Bon the Birthday Clown
- Raid the Cave (mentioned)
- The Hard Way
- Face the Music
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- Ludo's name means "play", "game", or "sport" in several languages.
- Ludo wishes to have a huge, muscular "big boy body" and be a lifeguard, as well as take over the universe.
- He bares resemblance to a kappa, a kind of Japanese turtle monster and sometimes deity.
- Ludo develops a fond taste for oysters in "Brittney's Party".
- He somewhat likes Brittney Wong for showing the same hate for Star that he has, as seen in "Brittney's Party".
- He is shown to have chaetophobia, a fear of hair, triggered through tickling in "Marco Grows a Beard". This comes from a traumatic experience with "The Tickle Monster", that he had during a birthday party when he was a boy.
- Ironically, he grows a beard in "Ludo in the Wild".
- Ludo states in "The Hard Way" that he was hatched from one of fifty eggs and that, due to the lack of a proper father figure or any guidance, he had to learn things dirty while growing up.
- Alan Tudyk, Ludo's voice actor, also provides the voice of King Butterfly.