I am a Vata-Pitta, like my mother, meaning Vata and Pitta energy are more prominent in my body than Kapha energy. Vatas tend to be thin and small of frame, with cold skin, dry hair, and joints that crack easily. They may be light sleepers and possess energetic demeanors. Pittas have medium frames, and find it easy to gain/lose weight when they set their minds to it. They are purposeful and good at turning their ideas into reality. The three doshas tend to react differently to stressful situations; Vatas become anxious and worried, Pittas are irritable, and Kaphas grow depressed and withdrawn. In this case, I'm definitely a Vata. I get unnecessarily worried about things I can't control whenever my life is hectic.
Anyways, I thought this might be an interesting way to help develop characters. I always try to view my characters through a multitude of different perspectives. It gives me a more rounded understanding of their thoughts, actions, and emotions. Why not try looking at your protagonist through the lens of Indian medicine? This Dosha Quiz is a quick and simple way to determine your character's predominant dosha. After identifying the dosha(s), it will give you lists of foods this person may enjoy, both when they're healthy and when they're unhealthy (you are "unhealthy" when your dosha energy is out of balance), and ways they might react to certain situations.
Just some food for thought. There's no such thing as too much characterization, so if you've got time, check it out. And let me know how it works :).