His positive personality would make him an excellent servant. He's very determined, so he'd do whatever it takes to fulfill his duties. His friendly nature would also mean he could get along well with his master and other servants.
Naruto's outgoing and enthusiastic personality would have a big impact. He'd be eager to take on tasks and prove himself. His compassion would lead him to protect not just his master, but also those around him, which might sometimes put him in tricky situations in the servant role. Also, his naivete in some ways could make him vulnerable to manipulation at first, but he'd quickly learn and adapt.
Naruto is known for his tenacity and strong will. In the role of a servant in a fanfic, this would mean he wouldn't easily give up on difficult missions or tasks assigned by his master. His humorous side would lighten the mood in a servant - master relationship. However, his impulsive nature might sometimes cause him to act without thinking fully, which could be both a strength and a weakness. He might rush into a fight to protect his master without considering all the consequences, but his quick - thinking in battle from his ninja training would also come in handy. His loyalty, which is a big part of his personality, would ensure that he stays by his master's side through thick and thin.