Researching character design

I have research on character design and I came across an essay "Character development and its utilization for convergent media formats" by Vira Haglund 2012, summarizing what he wrote

The character has to be intriguing, the character need to make the audience want to see, read more about them. The viewer need to feel something for the protagonist. The character needs to be detailed for the viewer to care for. “In order to achieve an emotional bond between character and audience it is crucial to equip the character with traits, a personal background, motives, beliefs and values which are convincing and believable.” Haglund,V(2012)