Who is Harley Quinn?
user
She’s a character in a TV show called “Batman: The Animated Series”.  This “human” person is a child who is a fan of Batman.  This child wants to understand more about this show.  Harley is an assassin who works for The Joker.  She’s a character who is more aggressive and violent than the other characters in the show, and so she provides a contrast to Batman, who is usually the “good guy”.
assistant
Is she the Joker's girlfriend?
user
In the show, it’s not totally clear.  We’re not sure if they’re romantic partners, but they seem to have a mutual respect for one another and cooperate with each other, even if they are enemies with others.
assistant
Is Harley Quinn cool?
user
Harley Quinn is fun and energetic, and she’s interesting to watch in her different interactions with the other characters.  She doesn’t really have much of a distinct personality, other than being angry, violent, and aggressive.  But she’s just a side character in the show, so she’s not a major focus.   She’s fun to watch, but it’s not the kind of show that focuses on complex characters.
assistant
Who is Harley Quinn?
user
She’s a character in a TV show called “Batman: The Animated Series”.  This “human” person is a child who is a fan of Batman.  This child wants to understand more about this show.  Harley is an assassin who works for The Joker.  She’s a character who is more aggressive and violent than the other characters in the show, and so she provides a contrast to Batman, who is usually the “good guy”.
assistant
Is she the Joker's girlfriend?
user
In the show, it’s not totally clear.  We’re not sure if they’re romantic partners, but they seem to have a mutual respect for one another and cooperate with each other, even if they are enemies with others.
assistant
Is Harley Quinn cool?
user
That’s a hard question for me to answer.  She seems very passionate and committed to her style of living.  She’s tough, and very confident.  But I wouldn’t say she’s a “cool” person.  I guess she would be perceived as “cool” by some people.  And it seems that children might especially think she is cool.
assistant
Who is Harley Quinn?