Willy Wonka is a character in the novel "Charlie and the Chocolate Factory": He's the owner of a mysterious candy factory who allows five lucky children inside. Author Roald Dahl described the character very specifically in his novel, which you can use as a pattern to draw the character yourself. If you wish, you can add variations -- creating your own take on the character -- but certain basic characteristics remain in place.
Sketch out a stick figure in the basic pose you want for Willy Wonka using pencils. Draw ovals for the head, chest, hands and feet. They should be fairly narrow: Dahl describes Wonka as a "little" man, "like a quick, clever old squirrel from the park," so you want the image to emphasise a thin and wiry figure. The average human should be drawn at about seven-and-a-half heads in height. Wonka's frame should be smaller, perhaps six or six-and-a-half heads.
Draw cylinders in pencil around the stick figure to form the various parts of Wonka's body: his forearms, upper arms, neck, torso, waist, thighs and shins. This should give you a rough figure upon which to add details. Keep Wonka's small figure in mind; make the cylinders thin to give him a tiny appearance.
Draw the specifics of Wonka's face. The eyes should be midway up the face, with the nose below it. Cheekbones should be sketched midway between the bottom of the nose and the chin, as should the mouth. Dahl describes Wonka as being bright-eyed and full of mischief, so you may want to give him a grin and smile lines around his eyes. He also sports a "jet black" goatee on his chin and a black top hat.
Add specific details to the body to fill in Wonka's appearance. Dahl describes him as wearing trousers, gloves, a tail coat and a top hat, as well as a cane in his hand. There's plenty of room for artistic interpretation here, so feel free to express yourself.
Ink in the permanent lines of the drawing and erase the pencil marks to complete the image. If you wish, you can colour the picture to provide a more complete image. According to Dahl's text, Wonka's coat is plum coloured, his trousers are green, his hat is black and his gloves are grey. The cane is topped with gold.
The two movie versions of the character differ significantly from the version described in Dahl's text. If you wish to draw one of them, study the facial features of either Gene Wilder or Johnny Depp carefully, then pattern the drawing after them. Specific details, such as Wilder's signature curly hair or Depp's Beatlemania wig, should definitely be included.