Hellcat is just an ordinary human which was a natural athlete who was being trained by Avengers in the field of combat techniques and she was trained in martial arts by Moondragon. She has a power of "demon sight" which allow her to sense mystical phenomena or items that have mystical energy.Her original name is Patricia Walker Baxter Hellstrom a daughter of comic book writers.Source here
image sourceShe is now with the Lady Liberators team and formerly joined Avenger where is truly enhance her powers and fighting ability.With her current fighting skills and abilities surely villains will having a hard time with her.Source here