But she indeed has a similar crisis of faith. She isn't trying to find a purpose, she was trying to understand what it meant to be human. It isn't in Nia's character to extendedly grieve, but her own type of insecurity was delivered plenty through the show. She asks for a proper burial of her sisters in order to validate her own existence, she hesitates to kill her father in episode 15, she in at first scared of Simon's proposal because she wants to protect her own identity and she ultimately asks him to allow her in order to become Nia once again.

And "every single other cast member"? How were Viral or Yoko given more of an individual crucible than Nia? How was Kamina given more of an individual crucible than Nia? I remember Kamina screaming for his father for a brief sequence in episode 2 and "forgetting" about it in subsequent adventures.