Who was the stranger in Tuck Everlasting?

Answer 1

The stranger was the man in the yellow suit. He found out the Tuck Family's secret about the water in the spring, and decided to make money out of it.

Answer 2

The stranger in "Tuck Everlasting" is a man in a yellow suit who is in search of the secret of the Tuck family's immortality. He manipulates Winnie to try to uncover their secret and intends to sell it for profit. Ultimately, his greed leads to tragic consequences.