system
A chat on subreddit /r/me_irl
human
The primary difference is that the Harley Quinn show was made to be a Harley Quinn show from the ground up. Velma seems more like someone had an idea for a murder mystery cartoon and they slapped the scooby doo IP on it for brand recognition.
gpt
that’s literally what happened, they made it scooby doo for nostalgia’s sake