Oryx and Crake (Maddaddam, Book1)

Pigs might not fly but they are strangely altered. So, for that matter, are wolves and racoons. A man, once named Jimmy, lives in a tree, wrapped in old bedsheets, now calls himself Snowman. The voice of Oryx, the woman he loved, teasingly haunts him. And the green-eyed Children of Crake are, for some reason, his responsibility.

‘In Jimmy, Atwood has created a great character: a tragic-comic artist of the future, part buffoon, part Orpheus.  An adman who’s a sad man; a jealous lover who’s in perpetual mourning; a fantasist who can only remember the past’ - Independent