General:
* Embodiment: This emphasizes the physical and emotional embodiment of the character.
* Inhabit: This suggests a deep understanding and inhabiting of the character's mind and soul.
* Internalize: This focuses on the process of understanding and absorbing the character's traits and motivations.
* Transform: This highlights the visible change in the actor's appearance and behavior.
* Immerse: This signifies a complete absorption into the character's world and experience.
More specific:
* Method acting: This refers to a specific acting technique where actors delve deeply into their characters' psyches.
* Full commitment: This suggests a complete dedication to the role, without holding anything back.
* Living the role: This implies an almost obsessive focus on the character and its every detail.
Ultimately, the best word will depend on the context and the specific aspect of "getting into character" you want to emphasize.