Lunarito is the true main antagonist in the upcoming movie Manuelita who is the leader, master and boss of his gator minions, his pet vulture, and his business partner, François, Manuelita's former childhood friend and fiancé, and Bartolito's arch-enemy and rival. He is a towering, heavyset, massive, fierce turtle who seeks to marry Manuelita and to kill Bartolito (due to a fit of jealousy).
Lunarito is first shown as a large egg that had not hatched. A few moments later, the egg is swept away to the docks in Pehuajó. The egg was left at the doorstep of the Catholic orphanage. Then, the egg hatches, containing a baby snapping turtle.
As a child, Lunarito has freckles on his cheeks and a chubby and bulbous body. He also wears a propeller cap. He also has three small spikes on the sides and the top of his head. His eyes are red-orange and his scaly skin is dark olive green. He has a large shell with a bright forest green carapace with black markings and small spikes shaped like cones and a fiery orange plastron. He has mustard yellow color on his muzzle, palms and under his tail. Three of white spikes each shaped like a triangle running down his tail. His arms and legs are stubby and his tail is short. Three small sharp teeth are visible when Lunarito closes his mouth, two from the upper jaw and one from the lower. After consuming swamp gases he breathes, Lunarito underwent a transformative growth spurt, turning him into a muscular, grotesque brute taller than his gator minions themselves. His body also underwent individual changes: his sharp teeth look more like fangs, his shell became larger, stronger and harder as a rock, his tail is longer, and his small spikes grew larger and sharper like horns.
As a grown up, despite appearing obese, Lunarito is more bigger, bulkier and much stronger than any natural turtle, more hunched over, about the size of a large bear, and more similar to a crocodile-like appearance (the face) with three sharp horn-like spikes on top of his head shaped like the horns of the rhinoceros or a bull, being one large spike on the middle and two smaller spikes on the sides. He has a rhinoceros-like snout, almost human-like hands with four white sharp claws, bulky legs, and a slightly long lizard-like tail with a line of sharp white spikes that runs down the end of it. His arms are somewhat muscular and longer and his torso is much burlier, heavier and larger. His carapace is much tougher and has three rows of cream-colored spikes shaped like rose thorns running down its center, being three larger spikes on the middle and six smaller spikes on the sides. He resembles a prehistoric reptile. He occasionally wears a long red and black cape adorned with a golden coin-shaped clasp, making him look macho and more attractive to the ladies. Another noticeable feature is that he appears to be wearing nothing under his cape yet he wears white underpants with a seamless black and red heart pattern when out of his shell. Posing as the French gentleman Maximus Claude, he also puts on a fake French accent and wears a black monocle, a pair of white gloves and a black stovepipe top hat with a red band around its brim and a maroon feather in it which covers one of his spikes on his head and carries a black cane with a gold hooked head. He wore a skull of a giant crow as a helmet during his flight to Pehaujo and his final battle with Bartolito. Unlike other turtles in the film, he has three fingers and a thumb on each hand. He also has wrinkles and black rims around his red-orange eyes. His elbow and knee caps and finger joints also bulge out. He has large elephant-like feet with three white crocodile-like toes. Three of his visible teeth are becoming more crocodile-like. He is bipedal, though completely capable of quadrupedal movement.
As a child, Lunarito at first seemed like a curious, innocent, happy, attentive, bright, friendly, thoughtful, timid, gentle and not cruel as he would become. However, in town and at school, nobody likes him. He assumes he's in love with Manuelita because she blows a kiss in front of him. He brought Manuelita a bouquet of red rose flowers and she adored them, and nearly took it before Bartolito caught her attention after his fight with the crooks. He became heartbroken and went alone into the night. He was confused, ridiculed and brutally bullied by a group of crooks for being a loser and for his stupidity. After being teased by the crooks, he became insane, lost his temper, scare the crooks off, broke down in tears and ran away to live in the dark, gloomy and creepy swamp. As a result, Lunarito grew hateful towards Bartolito, determined to seek revenge on him for stealing Manuelita and humiliating him, went through a transformational growth spurt and became bigger and stronger than any other turtle. He was very proud of his large size and brute strength.
As a grown-up, Lunarito is an evil, self-proclaimed, overconfident, obsessive, cynical, sardonic, nefarious, bloodthirsty, roguish, lustful, brutal, vengeful, arrogant, egotistical, diabolical, flamboyant, thoughtless, nihilistic, vain, simple-thinking, scheming, snarly, rough, mean, scary, authoritative, obstreperous, tough and cold-hearted turtle who intends to marry Manuelita (much to the latter's dismay). He is shown to be snide and sarcastic, especially when he calls Bartolito a runt or "Shorty" and has no respect for him. Lunarito has a pet vulture as his second-in-command and follower, a large gang of theatrical alligators and his business partner, a sly and greedy French rat named François. He has little patience and a quick and easily-provoked temper (prone to losing his temper once) shown with anger at his gator minions' failures and at anyone who woos Manuelita and becomes hotheaded when insulted or irritated, which can both serve as his weakness and serve to make him even more dangerous. He is very self-absorbed, lacking any sort of empathy for others. Enraged at the failure, he throws a temper tantrum. Recomposing himself, he tells his pet and his minions that he decided to go to Paris and capture Manuelita's attention himself, posing as Maximus Claude. Later, he reacted explosively when he heard Manuelita escaped, as he tried to kill François with the sword and only becoming realized when he hears from his pet vulture that Manuelita traveled back Pehuajó. Although he gathered his gator minions, his pet vulture and his assistant François, he can also be annoyed, resentful and argumentative by their nonsensical stupidity and their clumsiness, especially when they are about to search for Manuelita. Personality-wise, Lunarito is very calm, charismatic and sophisticated but can easily be sent into a violent rage at the mention of Bartolito or by the incompetence of his minions. Lunarito is manipulative and delightfully sadistic, enjoying other people's pain and misery, making others suffer and is sinister, imperious, sociopathic, opportunistic, psychopathic, vituperative, power-hungry and unsympathetic, so he seeks dominance over everyone which carries out by the harsh and abusive way that treats François, using threats and verbal abuse to keep his loyalty in check but in the end it proved to be his end when François decides to betray Lunarito by lying to him. He is very treacherous, intelligent and knowledgeable, thinking things through before making any mistakes (most of the time). Lunarito is totally convinced in the belief of "might makes right" and used his tremendous physical strength to intimidate his rival, Bartolito. He also has no problem of trying destroy anyone that stands in his way and forcing Manuelita to marry him. He also has the funny though dark and kooky sense of humor.
Despite his cruel and power-mad nature, Lunarito have a softer side; he gets along reasonably well with his gator minions and his pet vulture. He suffers from obsessive love which is shown by his intense infatuation with Manuelita. Lunarito is also very stubborn, easily offended and also a bit delusional, continuing to pursue Manuelita despite the fact she truly loves Bartolito. He was a boy broken because he lived obsessed with his former life and desperately trying to relive it at any cost had he not learned to accept loss and move on with his life. He also has an unhealthy obsession with capturing and marrying Manuelita, even if it means having his own revenge, fighting Bartolito and competing with François. Seeing Manuelita as a perfect bride, he is determined to win Manuelita's love, though her love for Bartolito serves to thwart those plans. He considers Bartolito as a "Little Runt", Dopi as a "Blind Mole", and Larguirucho as a "Pinhead". He is also presented as something of a brute, as he refers to himself in third person. He acts as a foil to Bartolito.
- Lunarito's design is similar to Bowser/King Koopa from the Super Mario franchise and Tokka from the Teenage Mutant Ninja Turtles franchise.
- The cape Lunarito wears is similar to the one Grand Duke of Owls wore in Don Bluth's Rock-a-Doodle.
- He is very similar to Lumpjaw from the 1947 film Fun and Fancy Free.
- He is also similar to Grundel from Don Bluth's Thumbelina and Drake from Don Bluth's The Pebble and the Penguin in that Grundel falls in love with Thumbelina and Drake wants Marina to be his mate in general, so they also loved female protagonists and hates male protagonists.
- He has a similar character design from Captain Crocodile from Disney's Robin Hood.
- Lunarito also shares a similarity to Merlock the Magician in this way except that Lunarito has value for wealth or currency of any kind.
- Possibly due to the film's high amount of anthropomorphism, Lunarito (unlike other turtles) has razor-sharp teeth, fingers and a long tail. This is odd because in real life, turtles do not have any of these, to say nothing of the cape.
- Given his size and lure, he may be an alligator snapping turtle. Strangely, he is about the size of a large bear, although he is much taller than an average turtle.
- His roars, growls and hisses are a mixture of sounds of several animals such as lions, tigers, bears, leopards, jaguars, gorillas, elephants, walruses and crocodiles.
- In one scene, his roar is the same as the Sharptooth from The Land Before Time saga.
- In one scene, his roars, snarls, and growls are the same as Brutus and Nero from The Rescuers and Shere Khan from The Jungle Book.
- Some of his roars are the same as King Kong from the 1976 remake with the same name.
- He is very similar to Pete, like the body design and the gluttonous nature.
- He is similar to The Toad from DreamWorks' Flushed Away.
- He is also similar to Dave from Dreamworks' Penguins of Madagascar.
- Lunarito is similar to Oogie Boogie from Tim Burton's 1993 stop-motion Disney film The Nightmare Before Christmas in personality and voice since they are both voiced by Ken Page. However, Lunarito is more dramatic, lustful and tragic than Oogie Boogie.
- He is very similar to Ratigan from Disney's The Great Mouse Detective like the top hat and the calm and charismatic personality.
- He is very similar to Alameda Slim from Disney's Home on the Range like the disguise, the body design and the angry temper.
- He is similar to Sa'Luk from the 1996 Disney animated film Aladdin and the King of Thieves in that he is very power-mad and likes violence.
- He shares a lot of character traits with Ronno from Disney's Bambi in this way except that Lunarito seems like a friendly, innocent and not cruel as he becomes.
- However, Lunarito is much evil and more dangerous than Ronno.
- Lunarito can be considered to be the dark parallel of Bartolito who falls in love with Manuelita. While Lunarito has grown to be a biggest and strongest brute, Bartolito is now a handsome young man.
- His backstory is very similar to the origins of Kingpin from Marvel Comics. Both antagonists possess tremendous physical strength and resiliency.