Capsicum (bell pepper) is:

• Botanically: a fruit (a berry), because it develops from the flower’s ovary and contains seeds.
• In cooking: treated as a vegetable.

From a Jain dietary view:

• It is generally permitted, since it is not a root vegetable and grows above the ground.
• As with all foods, wash thoroughly, avoid eating after sunset, and follow any personal/sect vows your family observes.