Harley Quinn, also known as Dr. Harleen Quinzel, is a fictional character in the DC Comics universe. She was first introduced in Batman: The Animated Series in 1992 as the Joker’s love interest and henchwoman, and has since become a popular character in her own right.

Harley Quinn has many different names and terms of endearment for the Joker throughout the comics, TV shows, and movies in which she appears. Some of these names are more affectionate and loving, while others are more insulting and mocking.
- Puddin’: This is perhaps the most well-known nickname that Harley Quinn uses for the Joker. It is a term of endearment that she uses to show her love and loyalty to him. In the comics and animated shows, she often addresses him as “Mr. J” or “Mister Jay,” but “Puddin'” has become her signature nickname for him.
- Mistah J: This is another affectionate nickname that Harley Quinn uses for the Joker. It is a playful twist on the way she pronounces “Mister Jay.” She often uses this nickname when she is trying to get his attention or to show her affection for him.
- Mr. J: As mentioned above, this is a more formal nickname that Harley Quinn uses for the Joker. It is a sign of respect for him and his position as her boss and partner in crime.
- Clown Prince: This is a nickname that Harley Quinn uses for the Joker to acknowledge his status as the “Clown Prince of Crime.” It is both a term of endearment and a sign of her admiration for him.
- Joker Face: This is a more insulting nickname that Harley Quinn uses for the Joker. It is a mocking term that she uses to make fun of his appearance and to express her frustration or anger with him.
- Smiley: This is another nickname that Harley Quinn uses to acknowledge the Joker’s appearance. It is a playful and somewhat sarcastic term that she uses to tease him.
- J-Man: This is a variation of “Mr. J” that Harley Quinn sometimes uses. It is a more casual and informal nickname that she uses when she is feeling playful or affectionate.
Overall, the names that Harley Quinn uses for the Joker reflect her complicated relationship with him. She loves him deeply and is fiercely loyal to him, but she also has a mischievous and playful side that sometimes comes out in the nicknames she uses. Whether she is calling him “Puddin'” or “Joker Face,” her affection and devotion to him are clear.