Kaa is an enormous female Indian Reticulated python snake.
Kaa is a menacing and intelligent python. She is extremely manipulative, duplicitous and persuasive, using her hypnotic eyes and compellingly seductive voice to lull her prey into a false sense of security incredibly effectively.
She is shown to be very knowledgeable and intellectual, being precisely aware of how Shere Khan came to hate Man and how Mowgli even came to be an adopted cub with the wolves. She is also terrifyingly calm and composed, never raising her voice, so as not to draw away her prey. She is also shown to be very imaginative, cunning and smart, able to feign a compassionate and empathetic personality to pull Mowgli into her trap.
Obviously, her immense size makes her extremely powerful, and she is unafraid to grapple with a bear the size and weight of Baloo. However, she was unable to defeat him, while Baloo is stronger than her. Despite her conniving and treacherous nature, she is shown to be harmonious and tuneful when she sings her song "Trust in Me". However, she still has no redeeming qualities.
Kaa would clung to the branches of trees awaiting her prey. When spotting prey, she would speak softly to lure them in before hypnotizing them. As she talks to them she would wrap her coils around them to trap them. Once in range of prey, Kaa would open her massive maw, successfully reeling in her prey to a vicious, gaping maw of sharp teeth.
After climbing into the trees and chasing animals that stoled his food, Kaa lurked out from some trees and soon began to speak to him from above the trees before revealing herself to him. Luring him in by promising to keep him safe, Kaa hypnotizes him and wraps him in her coils. She reveals that Mowgli came to live in the jungle because Shere Khan killed his father as they were traveling between villages, and that Bagheera later found Mowgli and brought him over to the wolves for protection.
She also reveals to him the power of the "Red Flower", being fire and its foresaw in her vision. Finishing her storytelling, Kaa lifts Mowgli to her jaws and nearly devours him, but a just before she can, a passing sloth bear named Baloo attacks Kaa and successfully rescues Mowgli, freeing him in the process. It is unknown if whether she was either killed or chased away by Baloo.