The Mystical Origins Of Indigo Children

So, you know those little online personality quizzes like, "Which 'Star Wars' character are you?" They're similar to the type of entertainment-driven horoscope articles (e.g., "What Mars means for you in 2022!") you might come across here and there, or an informal, unofficial 20-question MBTI (Myer's Briggs) personality inventory that gives you a Jungian moniker like "INFJ." It's a two-minute "get-to-know-yourself" self-help exercise that's as effortless to do as it is easy to question. It's in realms such as these that readers might have come across an eye-catching and clickable term, one that conceals a deeper history: Indigo Children.
Sites like Gaia jump on board without looking back, very sincerely headlining "13 Common Traits of Indigo Children" and then writing, "If you wonder if you might be of this distinct soul lineage, here are a few personality traits that may feel familiar." Traits include, "You have a strong intuition" and "You want to overthrow the man." Scary Mommy takes a more skeptical approach but also includes a full inventory containing agree or disagree statements. Those statements include, "I enjoy knowing why things are done" and "I've partaken in destructive behavior like alcohol and drug abuse." Also, the article says, Indigo Children don't like going to school. So basically 90% of humanity? 
In the end, Indigo Children are part-mystical gobbledygook, part-urban legend. They're connected to systems of vague religiosity and actual neurological disorders. But what, actually, are Indigo Children, and why is the notion controversial? 
The Mystical Origins Of Indigo Children (& Why The Movement Is Riddled With Controversy)