Which word describes someone characterized by intense emotion?

The term "fervent" refers to someone who displays intense emotion, passion, or enthusiasm. This word is often used to describe individuals who possess a deep, heartfelt commitment to their beliefs or interests, leading them to express strong feelings. For instance, a fervent supporter of a cause might demonstrate zeal and an unwavering dedication, exhibiting emotional intensity in their advocacy. This makes "fervent" the most fitting choice to describe someone characterized by intense emotion.

In contrast, "indifferent" suggests a lack of interest or concern, indicating a dispassionate or apathetic stance. "Apathetic" also reinforces this idea of emotional disengagement or lack of feeling. "Somber," on the other hand, relates more to a serious or gloomy demeanor rather than intense emotion itself, as it can describe a state of being subdued or reflective rather than one of passion or fervor.