This series needs more love, so gotta plug!
Afterschool Charisma is a manga series set in an exclusive high school for clones of famous artists and historical personages. The main character is the only non-clone in this high school, and we get a pretty interesting view into the school and how such a thing might play out. It's very good, but don't expect too much slice of life. Sh*t gets real very quickly
http://www.sigikki.com/series/afterscho ... ndex.shtml