Fish eel
The eel swims around in a seemingly random pattern, turning to avoid obstacles. It does not cause any damage to Naija and she will bounce off upon contact.

If Naija sings when there's an Eel swimming nearby then it will change colour and begin to circle her. By changing notes before each complete rotation, the eel will continue to circle. After three rotations, the eel will drop Eel Oil.

Eel Song