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This article lists the characters in the four series and three special episodes of the British sitcom Blackadder. Blackadder was notable for featuring many repeating characters and actors, with Rowan Atkinson as the central character Edmund Blackadder, and Tony Robinson as his sidekick Baldrick, together with numerous other actors in one-off parts.

Baldrick is the name of several characters throughout the series. Each one serves as Blackadder's servant, sidekick and acts as a foil to the lead character. Baldrick is the only character besides Blackadder himself to appear in all instalments of the series, and can arguably be seen as Blackadder's best friend despite Blackadder's apparent contempt for him.

Melchett (Stephen Fry) is a family line. There were two main Melchetts: Lord Melchett and General Melchett.

Melchett shared the trademark bellow "Baaah!" with Fry's earlier portrayal of Wellington, which would be delivered at random intervals for no apparent reason. In a BBC Four interview broadcast on 17 August 2007 and uploaded by the BBC to YouTube, Fry goes into some depth on the "odd history" of Melchett's "Baaah!", explaining that it began as early as his work in student productions of Shakespeare at Queens' College, Cambridge, where he would produce strange noises in order to amuse the audience. He also notes that Melchett's "Baaah!" can be found (although in a more subtle form) in his other acting work such as Peter's Friends.

Lord Percy Percy (Tim McInnerny) is the name given to a pair of related characters. The Lord Percy of Blackadder II is the descendant of that seen in The Black Adder. The character derives his name from the factual Percy family. Unlike the first two Blackadders and Baldricks, the two Lord Percys are almost identical; both are portrayed as dim-witted, gullible and foppish. In the first series, Percy is Duke of Northumberland, while in the second he is heir to the title. The title of Duke of Northumberland was not in fact held by a real person surnamed Percy until 1766 when Hugh Percy, born Hugh Smithson, was awarded the title, although the title of the Earl of Northumberland was granted to a Percy in 1377.

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