Dren (Splice)

Dren is a monster in the film Splice. She was created by Elsa and Clive, two scientists who mixed human with multiple animal DNA. She matures fast as she was about six years old after twenty something days. She's at first violent but becomes friendly to the couple, but becomes violent again when she becomes much more mature. Later her molecular structure changes and she becomes a male. After this she/he kills Clive, his brother and thier boss and rapes Elsa. After, Elsa kills Dren by crushing her/him's head with a rock twice.

At the end of the film it is shown that Elsa is pregnant, probably with Dren's child.

 Appearence 

When she was born she looked like a disformed creature with no hands but as she matured she started to look more human.

As an "adult" she looked like a human with no hair. She has a tail with a tip like a scorpion, webed feet, mostly black eyes and only four fingers (counting the thumb). Later in the film it is shown she can produce bat-like wings. She has aquatic lungs and needs to be underwater every once in a while.

When she became a male she looked a little more disfigured.

Dren couldn't talk but instead made bird-like noises (screething, cooing, etc,) exept at the end when she/he said "Inside Me" as she/he was raping Elsa.