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Captain Parolles is a deceitful character who brags about his triumphs in war but actually turns out to be a coward. This is one of the central features of characters known as alazons. He’s abandoned by Bertram in this play, the only person who was willing to trust him. This was despite the fact that other characters had encouraged Bertram not to trust him to begin with.
Dramatic Monologue: a conversation a speaker has with themselves or which is directed at a listener or reader who does not respond.
Shakespeare uses the type most notably with the bombastic and self-glorifying ensign Ancient Pistol in Henry IV, Part 2, The Merry Wives of Windsor and Henry V.  Other examples are "fashion's own knight", the Spaniard Armardo, in Love's Labour's Lost, the worthless Captain Parolles in All's Well That Ends Well, and Falstaff in Henry IV, Part 1 and Part 2, and The Merry Wives of Windsor. Sir Tophas of John Lyly's Endymion also fits the mold.
Alazons are usually used as a type of comic relief. These characters are clearly outrageous and admit to absurd deeds the reader, and the other characters, aren’t meant to take as fact. Depending on the character, they may be more or less likable. Someone like Falstaff is incredibly likable, while Pistol may be less so.
Here, readers can get a sense of Parolles’ confidence as he speaks to Bertram and his style of speech.