Emo boys often may have more black within their hairstyle. The person may seem quieter depending upon who you talk to. This comes down to individual style though and there may be some bright colors thrown in to mix things up.
Emo girls may use black as the basic color or may alternate a bit more than the boys often will. Multiple colors do not even need to be used but rather one color can be used. It is then about making sure to have the hair cut and thinned properly.
