Celibate Hero: Although when Panacea kisses him at the end of Asterix the Legionary, he falls for her just as hard as Obelix did. He also appreciates Cleopatra's nose ("Very pretty!"). It's implied that he has a thing for Bravura.
Guile Hero: Where even magic-potion powered brute strength fails, Asterix uses his brains to defeat the obstacles in his way. In the Twelve Tasks story, he tricks a martial artist into telling him how to defeat him, gets a hypnotist to hypnotize himself and drives an entire asylum of bureaucrats insane by playing their own game against them.
Asterix's best friend and constant companion. As a baby, he fell into a cauldron of magic potion and drank quite a bit. Because of that, he's absolutely huge, and always wants to drink more potion (though Getafix won't let him). He sells menhirs.
Dramatic Irony: When he and Asterix were in Rome, Obelix wanted to fight with the Pretorian Guard. Asterix didn't let him. Obelix Super Strength let him defeat all the legionaries that patrol Gaul, a conquered country. The pretorian Guards are Elite Mooks that could destroy Obelix just because Obelix has never been challenged by anyone. Obelix strength is his weakness.
Ascended Extra: He was introduced as a literal Running Gag character in Asterix and the Banquet, as a tiny little dog that keeps following Asterix and Obelix aroud without them noticing. Readers liked him so much that he returned in the next album as Obelix's dog, and would go on to play important parts in later stories, even starring in short books and comics of his own.
The elder and druid of the village. He is responsible for the creation of the magical potion that made the village invincible.
Badass Grandpa: Not in the sense that he is good at fighting, but in the first book of the series, he gets captured and tortured by Romans for hours to get him to reveal the secret of Magic Potion. He remains completely impervious to it. In one story, he did drink his own potion and fought Romans alongside Asterix.
Distressed Dude: He's the most-frequently captured of the Gauls, due to his knowledge and crucial role in providing the magical potion to the village.
Authority Equals Asskicking: Played with. If there is an all-out threat that Asterix and Obelix can't manage alone, he takes the potion to fight like everybody else... but he always ends dropped to the floor by his carriers. On the other hand, he's shown to be either the second strongest person of the village after Obelix (whose Super Strength is active all the time), enough to deliver a Megaton Punchwithout magic potion.
Butt Monkey: Let's see, he has an overbearing wife, his carriers keep dropping him, and his village constantly fights amongst themselves with the slightest provocation.
Too Important to Walk: He's held up via Shield Surf by two Gauls. Unfortunately for his image, he ends up falling off for one reason or another (the main one being that the carriers are two different sizes).
The village bard and school teacher who is infamous for his infamously bad singing voice.
Always Camp: He's a singer, therefore has camp mannerisms and an imagined image of himself as a great, tortured artist.
Butt Monkey / Chew Toy: Is frequently tied up at the end of the book when the villagers are celebrating.note Frequently, but not always; he is present at the banquet in about a third of the books.
Drama Queen: Never makes a fuss about his physical mistreatment by the other characters unless he wasn't going to sing, but other than that there is no misfortune he can't overreact to.
Dreadful Musician: On occasion he's been shown to be an acceptable musician - for example, in Asterix and the Normans - but a terrible, terrible singer. He's so bad that he can cause storms to generate indoors. The other characters think nothing of resorting to violence to shut him up. None of this penetrates his illusion that he is a poetic genius...
Fired Teacher: In Asterix and the Secret Weapon he was fired from his role as the village school teacher.
Giftedly Bad: Despite his complete lack of talent, there are several characters over the course of the series who absolutely love his singing, and it has saved the day several times (such as by teaching the Normans the meaning of fear in Asterix and the Normans, or ending the Ganges valley drought in Asterix and the Magic Carpet).
Meaningful Name / Punny Name: Cacofonix, cacophony; Malacoustix, Mal + acoustics... less so in the original French (Assurances tous risques = Comprehensive insurance).
Nice Guy: He's said to be a very pleasant person as long as you don't let him sing.
Non-Action Guy: Unlike the other men of the village, he rarely takes part in fighting the Romans, only fighting when it is personal or there is no other option. Though he does do so once, beating the crap out of the Normans with a horn.
Small Name, Big Ego: Despite being a terrible singer, he thinks he is a talented one. The almost universally negative reactions of everyone who hears him do nothing to dispel his illusion.
Honor Before Reason: This is the reason why his fish isn't fresh; he could easily get fresh fish by just going fishing to the sea right next to the village, but he constantly insists on ordering it from Lutèce, arguing it's of better quality back here. By the time the fish arrives, it usually is already not fresh anymore.
Meaningful Name: In the British edition, he's Unhygienix. In the American, he's Epidemix.
Character Development: In the earliest albums, Caesar was little more than a villainous plot device that drove the Romans forward in their conquest of Europe; the original depiction doesnt even have the same design as the more well known version. Once he began to appear as an actual character rather than a generic Evil Emperor, he quickly became the dignified statesman he is for most of the series.
Friendly Enemy: Very much so; he holds no personal inemity against the Gauls, despite having the ambition to conquer their last stronghold, and his main concern is the well being of Rome. Two episodes do show him being antagonistic towards them, notably Asterix and The Chieftain's Shield, and Asterix in Belgium.
Horrible Judge of Character: Cannot for the life of him see Brutus attacking him. Looking back at history, we already know what that cost him.
May-December Romance: With Cleopatra. They even have a child together. His name is Caesarion aka Ptolemy XV, and the reason Brutus takes on the Gauls' Village is Cleopatra sent the child to Asterix to keep him safe from Brutus.
Noble Demon: even though he is willing to use deception, tricks and manipulation, he will always keep his word when he makes a promise, and be grateful to his enemies when they help him. When he finds in "Asterix and Son" the Gauls protected his son with Cleopatra from a murderous, power-hungry Brutus intent on securing power in Rome, Caesar's more than amiable to repair the damage Brutus wreaked.
Third-Person Person: After explaining his plans to his lackeys: "Wow, he's amazing!" "Who?" "Well, you!" "Ah, him!"
Caesar's adoptive son.
The Brute: Well with a name like that... Later we see his tactical skill, it amounts to "Burn it to the ground".
Characterization Marches On: His appearance and general attitude has been largely unconsistant in the various cameos he made over the course of the series. It's not until Asterix and Son that he gets actually solid characterizations.
Foreshadowing: Just about every one of his appearances reminds us that he will kill Caesar (though not in the series).
Caesar: (having gotten up to lead the others to the dining hall) You too, my son!
Brutus: (thinking) He's starting to annoy me with those classical allusions of his! One of these days I'm going to up and...
The Starscream: Asterix and Son reveals Brutus was after the "son" Asterix had because that was really Caesaerion, the son of Caesar and Cleopatra, and Brutus had tried to find AND kill the child to secure his ascention to the Roman throne. This story shows him out for once as a true Big Bad, and Caesar is aghast at this treachery.
Top-Heavy Guy: Like most of the centurions, has huge hairy arms and chest with normal-sized legs.
Better To Sink Than Be Sunk: On occasion, they will scuttle their own ship when Asterix and Obelix turn up; it saves them a few knocks and amounts to the same thing in the end. It gets pretty hilarious if they sink it when Asterix and Obelix didn't intend to attack them anyways.
Boomerang Bigot: The captain seems to be a Gaul himself - he has a red beard and hair, wears a horned helmet, and swears by Gaulish gods.
Chew Toy: Almost always getting their ship destroyed, and it's hilarious.
Expy/Affectionate Parody: All of the pirates are expies of the characters from the Barbe Rouge (Redbeard) comics created by Jean-Michel Charlier and Victor Hubinon (and which, like Asterix itself, first appeared in the French comics periodical Pilote).
Origin Story: One album shows that the pirates were originally Roman slaves that were put to work on a Roman villa resort near Asterix village. After they talk the Gauls into letting them finish the project so the overseer will set them free, they are paid a wage they have earned, and are on their way, with the future pirate captain mentioning that they might invest in a ship.
Pirate Booty: Subverted; they always manage to cross paths with our heroes before they can steal enough to pay off their latest ship loan.
Reformed, but Rejected: In Asterix and the Cauldron, they give up piracy and open a restaurant instead. Unfortunately, Asterix and Obelix assume that they're the ones who stole the cauldron of coins and beat them up as per usual.
Face Death with Dignity: When she thinks Asterix wants to assassinate her, she holds a long speech about "showing the barbarians how a queen dies". Asterix eventually gets impatient and manages to throw a word in.
Hide Your Children: To protect her son with Caesar in "Asterix and Son," she sends him to the Gauls' Village. It leads for a Dramatic Reveal when Caesar finds out the truth of Brutus' treachery.
May-December Romance: With Caesar. And has a son with Caesar, Ptolemy XV Caesarion, who she hides in the Gauls' Village in "Asterix and Son" when Brutus tries to kill the child.
The best architect in Alexandria...which isn't saying much. Edifis' ramshackled buildings are the joke of everyone not living in them. In spite of this, he's given the job of constructing the palace for Caesar in three months, or be fed to the sacred crocodiles.