Count von Count is a mysterious but friendly vampire-like Muppet on Sesame Street who is meant to parody Bela Lugosi's portrayal of Count Dracula. He first appeared on the show in 1972, in episode 0406, the Season 4 premiere with Bert and Ernie.
The Count has a compulsive love of counting (arithmomania); he will count anything and everything, regardless of size, amount, or how much annoyance he causes others around him. In one song he stated that he sometimes even counts himself. When he finishes counting, The Count laughs and announces his total (which sometimes appears on screen). This finale is usually accompanied by a crash of thunder and a flash of lightning. According to the story "Who Stole the Count's Thunder?" written by Tony Geiss, the Count has a personal cloud that hovers over his head and provides the thunder and lightning that lets him "know" when he has finished counting.
When the Count sings, the music that accompanies him resembles Roma music, no matter what the song.
The Count's Sesame Workshop profile does not use the word vampire but does suggests that he may be a distant relative of Count Dracula. However, the book Sesame Street Unpaved describes The Count as a "Numerical Vampire." In contrast, the 2001 Sesame Street Muppets Drawing Guide insists "The Count is not a vampire."
Nevertheless, the Count resembles Bela Lugosi's portrayal of Dracula in voice (speaking in an Eastern European accent and pronouncing his Vs as Ws), appearance, and sometimes mannerisms. For example, in early sketches, the Count waves his hands to exercise hypnotic power over other Muppets and holds his cape over the lower part of his face while moving. In addition, an early skit revealed that the Count shows no reflection in a mirror. Unlike vampires as traditionally depicted in legend and motion pictures, however, the Count often relaxes in the sunlight (as seen in "Counting Vacation" and "Coconut Counting Man," among others). Furthermore, the Count has never demonstrated a fondness for blood or the ability to turn into a bat.
The Count lives in an old, cobweb-infested castle that he shares with many bats. Sometimes he counts them. Some of the pet bats are named, including Grisha, Misha, Sasha, and Tattiana. He also has a cat, Fatatita, and an octopus named Octavia. He also plays a large pipe organ, and in some illustrations he is seen playing the violin. In recent years, the Count has appeared on each episode to announce the Number of the Day, playing notes on his organ to count up to the featured number.
The Count's most recent girlfriend, Countess von Backwards, is known for counting backwards. He had previously been linked to Countess Dahling von Dahling and shared a brief romantic tryst with Lady Two. His brother and mother have made appearances on the show, and he also has an Uncle Uno.
Norman told me he was writing this piece with this new character who's called the Count... He's a vampire, but not a real vampire... He just has a jones for numbers. He's obsessed with counting things. So I went, "Oh, cool," and I went to Jim [Henson] and said, "You know, Norman's writing this new character called the Count." Jim said, "Let me hear it." So I went (in my Count voice), "Yes, I vould love to do it!" and Jim said, "Yes, you can do it." 
The Count is now a friendly, non-threatening figure on the Street, but his early appearances in 1972 had a more sinister edge. He had hypnotic powers, and was able to stun other Muppets by waving his hands. After counting, he uttered a villainous laugh as lightning flashed in moody colors. He was often accompanied by creepy organ music. As the character matured, the sinister aspect of his personality was toned down, and his laugh became a throaty, Lugosi-style chuckle.
He made cameo appearances in The Muppet Movie (in the finale) and The Muppets Take Manhattan (in the wedding), and has also been featured in the Sesame Street movies Follow That Bird and The Adventures of Elmo in Grouchland. He also appeared in The Muppets: A Celebration of 30 Years and A Muppet Family Christmas.
On December 11 2008, the Count was interviewed on More or Less, a BBC radio show about numbers.