What is the guys name who supposed to be moody in harry potter and goblet of fire?

You're likely thinking of Viktor Krum, the Bulgarian Quidditch player who competes in the Triwizard Tournament in Harry Potter and the Goblet of Fire. He's often described as brooding and mysterious, especially in his early interactions with Hermione Granger.

While not explicitly called "moody," he's definitely portrayed as someone who keeps to himself and doesn't readily open up to others.