Everything you need to understand or teach Masque by F. Paul Wilson.
Masque, published in 1998, recounts the adventures of Tristan, a mime. Tristan is not a mime of the street clown variety, but an artificially created clone who can be programmed through his metamorphic DNA into a "masque"; a perfect genetic copy of anyone or anything.
A spy for Kaze Glom, Tristan longs for selfhood, a permanent form, which will give him freedom. On what is to be his last mission, however, he learns that...