I think it is a person speaking to his/herself.

At one point, towards the end, the multi-personality in this person is exposed but doesn't get so separate completely from the sane side. The song ends, "But you'll get nothing from me, But enemies, Enemies, Enemies," here the person has calmed down and comes back to his/her senses. I interpret the ending as the person telling his/her negative side: "You will not get the best of me."