Who is Nikita in tuck everlasting?

Nikita is the oldest son of the immortal Tuck family. He, his brother Miles, and his parents Mae and Angus all drink from a magical spring when they are teenagers, and it gives them immortality.

Nikita became a cruel immortal. While everyone else in his family grew to dislike the idea of immortality, Nikita thrived on it. While the rest of his family hid their immortality, Nikita had no qualms about flaunting it. He'd frequently threaten people.