The Old Man
The old man is the main protagonist of the story, as it details his journey through ageing. He begins with being a healthy person who, as he ages, becomes frailer and subject to medical aid. He is treated like a test subject by doctors as they try to treat him.
Norval
This is a fish that the old man sees in its tank and befriends. The fish is a source of support for the old man is the only thing that keep his life normal amongst all the hectic things going on in his life.