Ravi's powers were unexpected, but a blessing and curse in disguise. A blessing because they helped them escape their prision that they were made in, and a curse because it also brought pain into their life. Shadows and darkness cannot exist without light. They are intertwined for all of eternity, but that doesn't mean Ravi has to enjoy it.
Ravi was the success of experiments done by humans. They managed to turn a shadow into a conscious being. When Ravi finally escaped them, the only thing they took was a tablet. This tablet became life line for them, providing a place to record their thoughts, journeys and questions.