Killing Mario aside, remember that clones can be very different from the parent. Somatic cell nuclear transfer, the method of cloning we're most familiar with, can easily lead to mutations. A female clone would be perfectly normal, as somatic cells probably would not contain the exact same genes as those that formed the host's egg. Speaking of which, you still need an egg for cloning to insert a nucleus.
Even so, I don't think cloning Bowser would lead to such a wide variety of personalities, postures, and hairstyles. Bowser Jr. is a likely candidate, though.