I never dream that I am another person, but I shapeshift. When I first started lucid dreaming a lot since I joined this website I go through phases.
My main form in lucid dreams is a desert nomad, all in white. Also Pan, minotaur, werecat, vampire, are my main forms. I also have become a six-armed, six-legged, six-horned centaur, a dragon, a gargoyle, a rubber ball, a unicorn, a bull, an android, a Green Lantern, a devil-man, an angel, a Dark Knight, a bloated six-legged two armed spider, an Ent, a merman, Kamapua'a (the Hawaiian pig-god, also a shapeshifter), a samurai, a Fairy King, Peter Pan and Buddha.
In my non-lucids I am my normal self, unless I am in my Inner World, then I am often a white rabbit with a long tail like a cat.
Oh, and I became a girl a few times on purpose.