Sexual psychomorph

From Tardis Wiki, the free Doctor Who reference

Sexual psychomorphs were genetically engineered from several species by military scientists. The intention was to create a being that would morph into any form according to the desires of the person in its company because it would be hard to kill a person one sexually desired.

A psychomorph was neither male nor female and could change their form quite drastically, including increasing size and mass, changing skin colour to black or blue, changing the type and shape of their genitalia (AUDIO: Orr) and even creating a working elevator within their body. (AUDIO: Superiority Complex)

After staying in close proximity to one person, they could perfectly reproduce the appearance and voice of someone they loved or desired. (AUDIO: Orr) At least once, Orr mimicked several individuals simultaneously (AUDIO: Love Rat) They reacted to most sentient beings, whether humanoid, (AUDIO: Orr) parasitic (AUDIO: Love Rat) or inanimate. (AUDIO: Superiority Complex, A Kill to a View) They also reacted to non-sexual desires, such as religious desires of groups of people. (AUDIO: Herald of the Dawn) The changes in their body were subconscious and could not be easily controlled. (AUDIO: Love Rat) Flirting with the object they were reacting to was also a reflex though it could be tempered.

Psychomorphs lived long lives though did not show their age. (AUDIO: Orr) They were hypoallergenic in both directions, meaning that they did not have allergic reactions and others did not have allergic reactions to them. (AUDIO: Love Rat)