Niger is a black she-cat living in the Sewer's cats community. She's slender and carries on her body many scars, revealing her combative nature. Niger is extremely aggressive when she met Francis for the first time, expressing her desire to kill him.

However after Francis saves her life, killing Rhodes, and earning the interest of Saffron, Niger start being friendly and told her past and Hugo's story.

Niger's childhood was terrible, like every other cat of the sewer: she was gifted to a child and had the name of Cindy at the time. Soon the child was bored and she was pulled inside a plastic bag and thrown in a river. She survived thanks to a hole in the bag and reached the sewer.

After living underground, she turned blind as the other cats of the community: Niger turned infertile like all the other she-cats.