The main character. He is the king of the Britons. God sent him and his knights on a quest to find the Holy Grail. Acts very stoic considering the amount of strangeness happening around him.Tropes associated with this version of King Arthur:
Informed Attribute: Played for laughs. He is supposed to be wise, but makes very big mistakes and acts like a fool.
Insane Troll Logic: Employs this to help villagers expose a witch. It went like this: Witches burn. Wood also burns. Wood floats. Ducks also float. So if someone weighs the same as a duck, she is made of wood and is therefore a witch.
Incorruptible Pure Pureness: Parodied. He tries to resist the allure of one hundred and sixty nymphomaniac blondes and brunettes between the ages of 16 to 19, but eventually starts to succumb to their temptations and actually decides to give in, just as Lancelot comes in and drags him away. He then begs to be allowed to go back and face the "peril."
Too Dumb to Live: His inability to decide whether blue or yellow is his favourite colour leads to rather fatal results.
Sir Robin the Not-Quite-So-Brave-As-Sir-Lancelot
Played by: Eric Idle
Sir Robin claims to be very brave. He also has a band of minstrels singing about his bravery...but is an enormous coward. He is fully designated as "Sir Robin the Not-Quite-So-Brave-As-Sir-Lancelot who had nearly fought the Dragon of Angnor,who had nearly stood up to the vicious Chicken of Bristol and who had personally wet himself at the Battle of Badon Hill".
Bring My Brown Pants: He is known of personally wetting himself at the battle for Badon Hill. He also did it when the Killer Rabbit made his first victim.
Coward Has A Point: There was literally no reason for him to stick around and fight the Three Headed Knight. Said Knight did not obstruct the path in any way and didn't seem to mind when Robin figured this out.
A bunch of French soldiers that like to insult 'English types' with random insults. Reappear in the end where they claimed the Castle Aaargh as their own.
Abnormal Ammo: Subverted. The French try to scare the Knights of the Round Table away by throwing living animals at them. While the scene looks strange, the DVD commentary reveals it has really been done in history, but not with the kinds of animals used in the movie.
They also catapult the Trojan rabbit at the knights.
Gosh Dang It to Heck!: Despite their constant insults, they never actually swear. The gag is that they pretty much use the most colourful insults possible without outright saying anything profane (at least by modern standards).
An order of knights based on protecting the sacred words of Ni, Peng and Nee-wom.Like it says on the tin, they frequently say 'NI!' as a Brown Note of sorts. Their leader is a very tall man who wears a large helmet with antlers. He is the one who speaks in behalf of the whole order. The rest of the knights only say 'NI!' and mostly repeat what the head knight is saying.They live in a spooky forest and coerce every traveler into buying a shrubbery for them.
Impossible Task: They tell Arthur that in order to get past them, he must cut down the mightiest tree in the forest with a herring. Luckily, Arthur discovers their weakness, so he doesn't actually have to go through with it.
The Dreaded: The Knights who say Ni! appear to have a terrifying reputation, considering the fact they inspire fear within nearby villages, maybe even the whole country, cause the shrubbery-economy to collapse and make a fearful king Arthur do their bidding. Anyone who terrifies King Arthur like that is worthy of being called 'the Dreaded'.
The Determinator: He built a castle in a swamp just to show the other kings it's possible to do so. It sank into the swamp. The same happened to the second castle. Guess what? He built a third castle in the swamp...which burned down, fell over, then sank into the swamp. But the fourth and current one stayed up.
He guards the Bridge of Death and asks each traveler 3 questions. If they answer correctly, they may pass. When answering a question wrong, an invisible force grabs the victim and throws him into the gorge of eternal peril.
What Could Have Been: In an earlier script, the bridgekeeper was stated to return as the boatkeeper, guarding the boat that sails to Castle Aaargh. He would greet any traveler with; "Who wants to cross the Sea of Fate must answer me questions twenty eight." Arthur and Bedevere would have defeated him by simply throwing him into the lake.
These guards refuse to believe Arthur is king and instead break the fourth wall, by lampshading his use of coconuts instead of a real horse. After that, they start a useless discussion if swallows are able to bring coconuts to England.
Brick Joke / Chekhov's Gun: Their useless discussion does provide Arthur with a means to defeat the bridgekeeper when he starts asking a question about swallows.
The Faceless: They're only seen from below the ramparts. The distance, fog and lack of luminosity do not allow to see their faces.
A 37-year-old peasant, whose community is based on a political system thats too modern for the dark ages. It certainly has no place for a mythical king like Arthur, which Dennis openly shows. This starts another pointless discussion in which Dennis wants to prove that just wielding Excalibur is not a reason to boss people around.
God appears to the Knights of the Round Table and gives them the task to find the Holy Grail. He finds it annoying that people constantly consider themselves unworthy of His presence. His face is based on the cricket player W.G. Grace.
God: Its like those miserable psalms, they are so depressing!
Talking to Himself: He is actually voiced by Graham Chapman, the actor who plays Arthur himself.
Played by: John Young
This Historian tells the audience about Arthur's defeat at the hands of the French. He also explains that the knights continued their search separately. He is killed by a knight riding on a real horse. His death sets up the events happening in the end of the film.
Chekhov's Gunman: His death causes the film to end an anticlimax as the knights are arrested by the police for being well, knights
The son of the king of Swamp Castle. He is very girly and does not like the fact he is used in an arranged marriage. When he wants to express his feelings, he starts singing, complete with cheesy music in the background, but this is always interrupted by his father, who hates singing. Being fed up with his life, he shoots a message out of the window, which is found by Lancelot. Lancelot thinks the message is from a princess and goes on a rampage to rescue Herbert.
Catches Arthur and Bedivere coercing an old woman by saying Ni to her. After expressing his disappointment in them, he reveals he is a shrubber. This gives Arthur an opportunity to bring a shrubbery to the Knights of Ni.
Deus ex Machina: Its very convenient that a shrubber appears when Arthur needs a shrubbery.
A powerful and eccentric wizard Playing with Fire. He tells the knights about the cave of Caerbannog and the Killer Rabbit. Naturally, he is called a liar when the knights see the rabbit, but has the last laugh when some of the knights get killed by the rabbit.
Dark Is Not Evil: He comes over as a very intimidating and evil looking wizard, complete with a black robe and horns on his hat, but is does not appear to be malevolent. He honestly warns the knights about the rabbit and only laughs at them when they stop taking him seriously.
Large Ham: He even starts to spit drops of saliva when warning the knights about the Rabbit.
A monk and scholar. He gives the Holy Hand Grenade to the Knights when they need a way to defeat the Killer Rabbit. He also translates the runes inside the Cave of Caerbannog, but is eaten by the black beast of Aaarrrrggghhh.
We Hardly Knew Ye: Gets eaten right after guiding the knights to the cavern showing the Grail's location and reading the ancient text on the wall.
The Dung Ages: Of all characters in the movie, he's the one who embodies the trope.
Inspector End of Film
A modern inspector who investigates the Historians death. He is something of a running joke, in that he constantly appears at scenes where Arthur and his knights previously were. He later appears at the end of the film, to arrest Arthur and Bedivere for allegedly killing the Historian.