Animagus

An Animagus is a witch or wizard in the Harry Potter series who has the ability to transform into a specific animal at will. This transformation requires significant magical skill and training, and the individual's animal form is typically a reflection of their personality. The process is complex and can take years to master. Animagi must register with the Ministry of Magic to ensure they are not misusing their powers. Notable Animagi include characters like Professor McGonagall, who becomes a cat, and Sirius Black, who transforms into a dog.