Ren is Lindow's God Arc personified and can only be seen by the new leader who absorbed Lindow’s God Arc. He has an odd manner of speaking and things that most people find strange or distasteful Ren finds interesting, particularly the First Love Juice. It is unknown how Ren’s manifestation came to be and has raised the question within Fenrir as to whether or not God Arc’s carry a mind of their own.
Being Lindow's God Arc he can recount interactions between Lindow and others with perfect clarity. During the battle against the transformed Lindow on Aegis Ren urged the new leader to kill Lindow either out of pity or because it was in his nature. Instead they entered Lindow’s mind where Ren was able to stop the mutation.