Monster Physiology

The mutative power in which one takes on drastic body changes that deviate from human-form.

Capability
The user can become various forms, with different abilities. usually not "natural", and is caused by some foriegn manipulations, such as the classic comic book power giver, "an industrial accident" or "bitten by an irradiated ...".

Usually goes hand in hand with power bestowal, being that the person is being forced to change

Variations
Giant Beast Mutation

Winged-Beast Mutation Shield-Beast Mutation Trasformation of Others
 * The power in which one gradually becomes a giant-like mutant upon obtaining this power. Can include hard skin, strong jaw, and slightly decreased intelligence. Can even cause the user to lose self-awareness, depending on the specific user.
 * The power in which one gradually becomes a winded-beast-like mutant upon obtaining this power. Includes intricate flight skills, tail, and even fire breath.
 * The power in which one gradually becomes a triceratops-like mutant upon obtaining this power. Includes reinforced body defense, facial horns, and increased body weight.
 * The use of one's powers to induce a forced transformation into a monster form in another person.

Limitations

 * May need practice or use a device in order to change back to original form.
 * May loose all sense of self in transformed state.
 * May change unwillingly.

Known Users

 * Dr. Jekyll (Dr. Jekyll and Mr. Hyde): Transforms into Mr. Hyde by way of a potion and reverts once it wears off.
 * Hulk, Dr. Bruce Banner (Marvel)
 * Sasuke (Naruto)Snowman.jpg
 * Jugo (Naruto Shippuden)
 * Amshell Goldsmith (Blood Plus)
 * Toguro (Yu Yu Hakusho)
 * Chiropterans (Blood Plus)
 * Arrancars (Bleach)
 * Vizards (Bleach)
 * Ichigo Kurosaki / Hollow Ichigo (Bleach)
 * She-Hulk (Marvel): Banner's cousin, he donated blood to her after she was shot multiple times, giving her some power.
 * Killer Croc, Waylon Jones (DC Comics): Gradually becomes a sentient, muscular and bipedal crocodile.
 * Lizard, Prof. Kurt Connors (Marvel): Side effect of a potion he created to regenerate his right arm.
 * Man-Bat (DC Comics)05.jpg
 * Davis Bloome (Smallville): Transforms into Doomsday
 * Thing/Ben Grimm (Marvel) One of the Fantastic Four
 * All of Ben's Omnitrix forms (Ben 10)
 * Kevin Levin, Aggregor, and other Osmosians (Ben 10)
 * Werewolves and Vampires, though not the ones born were wolves or vampires, only the ones that had been bitten and changed into ones
 * Venom (Marvel)
 * Carnage (Marvel)
 * Maryann Forrester (True Blood)04.jpg
 * Sandman (Marvel)
 * Chase Young (Xiaolin Showdown)
 * Torque (The Suffering)
 * Clayface( DC Comics)
 * Big time (Batman Beyond)
 * Beast Boy (Teen Titans)
 * Joseph Bertrand III (inFamous 2)
 * Dr N.Brio (Crash Bandicoot)
 * Ryoko Hakubi (Tenchi in Tokyo) via Jurai Light Stone
 * Bertrand (Infamous 2)Sasuke-curse-seal-level-22.jpg