Drones are the most biologically diverse class of changelings. Each drone is different, biologically and behaviorally, as a result of the extreme heterozygosity of the changeling Y chromosome, along with the introduction of foreign DNA from infiltrators, and has his own way of impressing the queen.
For example, my associate has eyes that glow, and he can cause them to blink much in the way a firefly might. And, while he never personally met any other drones, he tells me stories of the final queen's favorite partners who have long since passed, with features ranging from multiple horns, to flaming breath, and even bioelectrogenesis.
This diversity does present a few challenges when one is trying to make general statements about drones, and this is only worsened by the fact that only one drone is still alive, but one must try.
In general, drones possess a similar exoskeletal structure to those of soldiers, with holes in the legs to mitigate the intense weight of thick chitin, plates of armor on the back and stomach, translucent elytrous wings, a curved horn, large fangs, retractable frills on the back of the neck, and a tail.
They are all biologically male, and born live, but only from incubators that are fed a special diet and carrying only a single egg. The exact conditions of this development and the selection process of these special incubators are unknown, and we cannot access that information yet.
A drone remains independent of any hive mind for his entire life, and will live with his queen of origin until he reaches sexual maturity, whereupon the workers either drive him out or he is summoned to a courtship ceremony by the queen.
There is no such thing as inbreeding in the changeling world, due to the many behavioral and biological safeguards against it, such as the addition of foreign alleles into the gene pool via infiltrators.
Drones feed upon both love energy and certain bodily fluids of other creatures, specifically, those produced during sexual acts. It is the most efficient and potent method of obtaining love, as my associate tells me. They obtain this from prisoners, usually at feasts, although immature drones can take willing prisoners as concubines at their hive of origin.
A drone's concubines are considered to be serving the hive for as long as he is not mature, and, no matter what happens to him, the concubines he engaged with in his youth are exempt from serving the hive in any way, shape, or form, and are still considered his if he ever returns to that hive.
Drones also don't have what we would consider a normal digestive system, though they appear to on the outside. Their salivary glands have been modified to produce a composite of fragrant and flavorful proteins and saccharides, so that each drone can be identified by their unique taste and scent.
A drone's digestive tract connects to the outer surface of his body in three distinct locations, the mouth, the anus, and a series of small pores on the surface of his sex organs, all of which feed directly to a centralized stomach, which processes the fluid gathered directly into basic nutrients and love energy, which is absorbed without any waste products.