Animagus is a combination of the word "animal" and the Latin word "magus," meaning "animal warlock"
It takes skill, practice, and patience for casters to become Animagi. The process of becoming an Animagus is long and most people give up or get bored. It has potential to backfire and cause the transformation to go horribly wrong. Many witches and warlocks simply feel that their could be used in other ways. However, once a caster masters the process they are free to change at will. Animagi can only take on the form of one specific animal. This animal form is not chosen by the caster, but determined by their personality and inner traits (Sweet people become creatures like birds or dogs. Mean nasty people become creatures like Snakes and spiders.) The amount of time an Animagus is in animal form is also not restrained by the lifespan of said creature nor it there a limit to there animal form. A witch or warlocks may stay in animal for for years and if they chose to for as long as a natural human life. (70-80 years) If an Animagus undergoes a major physical change, such as the loss of a limb, their animal form will also reflect that. An Animagus still thinks as a human does when they are in their animal form.
Counter Spell: The counter spell is used force an Animagus out of its animal form.
Metamorphmagus
"meta" means "change," "morph" means "shape," and "magus" (in latin) means " magic Or warlock
Metamorphmagus: Are very rare in the supernatural world. It is a Witch or Warlock with the ability to change his or her physical appearance at will.
Difference between Animagi and Metamorphagi
Unlike Animagi, Metamorphmagi can take a wide variety of forms, changing sex and age, potentially looking like anyone at all, or even just changing a part of their appearances, such as the shape of their noses. They can change at will like Animagi, but with more possibility. The Largest difference however, is a Metamorphmagus is born, not made; it is not a skill that can be learned. This is a hereditary ability, but can sometimes skip a generation.
Transfiguration
"Transfiguration is some of the most complex and dangerous magic you will learn"
Transfiguration:is the taught in two forms Cross-Species Transfiguration and Human Transformation both take a lot of time to master.
Cross-Species Transfiguration: is transforming something into something of a different species. (i.e. Turning a cup into a bunny or a bunny into a dog)
Human Transfiguration: is a form of magic in which the caster transfigures human body parts or an entire human being into another form. Human Transfiguration is more difficult than any other form of Transfiguration. Human Transfiguration can be used to essentially replicate the natural abilities of Metamorphism, allowing the caster or the subject to take on an entirely different form or make various individual changes to their appearance, such as growing or changing the color of hair or taking on individual animal body parts. Although it is possible to transfigure humans into inanimate objects if is not safe and none reversible by the caster. Meaning if you turn your self into a lamp, Someone better know so they can change you back. This particular form of transformation is for very advanced students and is only allowed to be performed under supervision.
Danger!!!!!! It has been stated many times that human Transfiguration can go badly wrong when performed poorly. The user has the risk of getting stuck in his or her's transfigured state.
Untransfiguration:Can be done in two ways.
Spell: When preformed properly properly the potion can reverse a transformation. It returns something to its proper form, reversing the effects of a transfiguration. (poorly done transformations have a lower chance of being returned back to normal.)
Potion: When prepared properly the potion can reverse a transformation. It returns something to its proper form, reversing the effects of a transfiguration. (poorly done transformations have a lower chance of being returned back to normal.)
Transfiguration vs. Animagus transformation
The difference between Transfiguration and the Animagus transformation is that Animagus is the ability or "Power". Being an Animagus is an ability, and Transfiguring requires a spell.