Viktor entered Cee's head a long time ago, he now lives there and won't be persuaded to leave. The bird is said to be the source of Cee's anxieties, a whisperer, and teller of fears and lies.
He questions everything, all the time, and makes a habit of overthinking every situation. Viktor thinks he can see bad things before they happen, and uses this to prevent Cee from taking risks, and from trying new things.
Viktor likes falafel, and the sound of rain as it falls onto Cee's skull.