It's a subculture of Goth::
An emo person tends to be quiet, introspective, or shy and can be creative. They spend time alone or with people who share their interests listening to music or making emo-influenced art. They have deep emotions but aren't always only angry or sad.
The emo lifestyle includes dressing in emo fashion (tight pants, band shirts, statement patterns) and listening to emo bands (or going to their concerts). Contrary to some harmful stereotypes, self-harm and extreme anger and sadness are not parts of the emo lifestyle.
Emo rejects typical Gender roles. Of males and females
For Ellen being in SCA is roleplaying and immersing herself in a different role than that she enjoys.
Chris is slightly into the emo scene and wears some clothing of the culture

As you can see Emo is heavily influenced by Japan. Ian, at Chris's age, wore muscle shirts and baggy pants. He still does to an extent.
Also, Wednesday Adams is seen as Emo. As I said it's a lifestyle more than a sexual orientation.
Hope this helps.
Blessed be
Rikki