Salad Fingers is a man who has schizophrenia
and sees the world differently than us. When you see an episode, the setting is what he sees not you. The people he meets are seen and sound non-human save the corpse and the girl he talked to. He has three puppets which act as his other personas. Hubert is his murderous side and Jeremy is probably what he really is, but then there is Marjorie, his coforting side, possibly his mother's persona. He meets five people who are shown as the first litle boy (maybe a kid who he met one day),a high schooler (first victim maybe?) an adult who dies at his door step (maybe a neighbor he killed), that weird boy (probably the same little boy who he met and who nows likes him), and that little girl (might be a kid he killed, now haunts his mind). He has also secluded himself to the point of hallucination. He also turned psychotic at the loss of his friends who he probably killed and blamed the "War" (actually maybe the War is what made him crazy) on their deaths. He is also a gender confused
man who switches roles of Man to Woman to Boy and back to Man. His house or apartment is number 22 and his hallucinations turn into demented reality in a click. Salad Fingers is just a man who was messed up and now is lonely and psychotic.