fiyero
In the book, Fiyero is covered with blue, diamond-shaped tattoos and is unhappily married to a woman named Sarima and father to three children: Irji, Manek and Nor. He meets an early demise when he is brutally murdered by The Wizard's secret police, presumably because he is affiliated with Elphaba, who is now a fugitive from The Wizard. It is also noted that Fiyero has dark skin.
In the musical, the character has no tattoos (simply because the small designs did not translate well to the stage) and never married, but he is engaged (rather reluctantly) to Glinda. He is at first a careless, happy-go-lucky kid, but when he meets Elphaba, he begins to understand that there is more to life than having fun and never thinking. In the middle of his discovery, he is transformed unwittingly into the Scarecrow by Elphaba as she tries to save him from the Wizard's guards. He helps Elphaba stage her death and escapes with her out of Oz.
In the musical, Fiyero is the vehicle that makes a happy ending possible, by helping Elphaba escape. This is contradictory to the book, where he accidently contributes to the Witch's downfall. He was worriedly waiting for Elphaba, who had disappeared, when he was attacked and murdered by the Gale Force. Fiyero's death affects Elphaba deeply, leaving her struck with grief. She is left haunted by a sense of guilt and failure that eventually drives her to seek out Fiyero's widow and children in the isolated Vinkus castle, Kiamo Ko. Unfortunately for Elphaba, Sarima refuses to even listen to her confession concerning her late husband. Sarima does, however, due to custom, allow Elphaba to stay semipermanently in the castle with Liir, Elphaba's illegitimate son with Fiyero. This is where Elphaba is later (accidentally) killed by Dorothy.