Morgana Pendragon

History
Morgana is born in Camelot to Uther Pendragon and Lady Vivienne. Growing up in the household of Gorlois, Morgana and Gorlois are led to believe that they are father and daughter. When she is ten years old, Gorlois dies in battle and Morgana goes to live with her biological father, Uther Pendragon and grows up like siblings with Arthur Pendragon. Morgana isn't a queen-to-be, nevertheless she has a high rank in Camelot, as Uthers ward.

Relationships
In the first three seasons Morgana lives in Camelot and has a serving girl, named Guinevere (short: Gwen), who she is close friends with, despite their different ranks. Their friendship ends when Morgana turns against Camelot and leaves the kingdom and they develop a hostile relationship to each other, since Morgana wants to take her rightful place on the throne of Camelot and can't stand to see Gwen, who is in love with Arthur, sitting on the throne as queen instead. In season five Guinevere is kidnapped by Morgana and manipulated to believe that she can trust only Morgana and no one else, but the spell is broken by Merlin and Arthur a few episodes later.

In the first episodes Morgana seems to have a romantic interest in Arthur, even though she doesn't want to admit to it, but this storyline is cancelled quickly. Morgana and Arthur grew up together and share a fraternal relationship and even though they mostly spent their time mocking each other, it is visible that Morgana cares a great deal for Arthur and Arthur for her and Morgana's betrayal broke Arthur's heart. In 3x05 Morgana finds out that Arthur is his half-brother. In the season finale of season four Arthur and Morgana reunite and Morgana struggels with her feelings for a moment after Arthur puts his sword away and ask her what happened to her. In season five she continues to try and kill Arthur on many occasions and succeeds in the last episode of the show, when Mordred stabs him with a blade forged in a dragons breath, that Morgana gave him.

The hate for Arthur's father Uther started long before she became an enemy of Camelot, when Uther killed Guinevere's father. Morgana never shared Uther's hate towards magic and defied him on several occasions, e.g when she helpled Mordred out of the castle (1x08). She tried to have Uther assasinated after the death of Gwen's father, but backed down in the last moment and saved his life. Her real hate for Uther started after she returned to Camelot after she spend a year with Morgause and increased after she finds out that Uther is her biological father. Uther dies by the hand of one of Odin's men in 4x03, but only because Morgana created a necklace that reversed the effects of the healing spell when Merlin tried to save him.