In Jainism, "Baldev" or "Balabhadra" refers to one of the prominent figures in the Jain universal history, particularly among the 63 Shalaka Purushas (illustrious persons). There are 9 Balabhadras in each half-cycle of time (Avasarpini and Utsarpini). Each Balabhadra is known for their great strength, virtue, and non-violent nature.

The term "Kaya" in Jainism generally means "body" or "form." In the context of the Balabhadras, their "kaya" refers to their human form. All Balabhadras are born as human beings, specifically as kshatriyas (warrior class), and possess extraordinary physical strength but are always non-violent (ahimsa) in their actions. Unlike Vasudevas (their counterparts), Balabhadras do not engage in violence and always follow the path of righteousness.

In Jain iconography, Balabhadras are often depicted with certain symbols (like the plough) and sometimes in a white or golden complexion. The most well-known Balabhadra in the current time cycle is Balarama, the elder brother of Lord Krishna.

Summary:

• "Kaya" of all Balabhadras is human.
• They are born as kshatriyas.
• Known for virtue, strength, and non-violence.
• Depicted with specific Jain symbols (e.g., plough).
• There are 9 Balabhadras in each half-cycle according to Jain tradition.

If you have a specific Balabhadra in mind or seek detailed descriptions of their forms or stories, please specify!