Which word would characterize someone who has an energy-filled, lively presence?

The word "vigor" is the most fitting choice to describe someone who has an energy-filled, lively presence. "Vigor" refers to physical strength, good health, or energetic activity, which encapsulates the essence of someone vibrant and full of life. This term suggests not only a lively demeanor but also a dynamic and robust engagement with their surroundings, which aligns perfectly with the idea of someone exuding energy and positivity.

In contrast, the other options present qualities that do not align with an energetic presence. "Torpid" denotes a state of inactivity or lethargy, suggesting a lack of energy. "Sullen" refers to a gloomy or morose state, indicating a disposition that is withdrawn or unhappy. "Traitor," on the other hand, represents betrayal or disloyalty, which does not imply any specific energy or liveliness and instead conveys a negative characterization. Thus, "vigor" stands out as the word that best captures the essence of someone vibrant and full of energy.