Here's a breakdown of her character:
Lucy:
* The "true" Lucy: This is the violent, murderous side of Lucy. She is driven by rage and hatred, stemming from the cruel experiments she endured and the abuse she suffered as a Diclonius. She is manipulative, cunning, and brutally efficient in taking down her enemies.
* Her motivation: Lucy seeks revenge against humans for the pain and suffering they inflicted on her.
* Her nature: Lucy's "true" personality is terrifying, and she enjoys the chaos and suffering she inflicts.
Nyu:
* The "child" side: This is the innocent and childlike side of Lucy. She's amnesiac and has no memory of her past life as Lucy. She's sweet, gentle, and dependent on others.
* Her personality: Nyu is a stark contrast to Lucy, embodying innocence and vulnerability.
The Connection:
* Dual personalities: The two personalities are intertwined, with Nyu being a suppressed state of Lucy's mind.
* Trigger: The switch between Nyu and Lucy often happens when Lucy is subjected to intense emotions or stress, such as violence, danger, or pain.
Overall:
Lucy's character is a complex and tragic exploration of the nature of violence, trauma, and the struggle for identity. She is both a monster and a victim, making her a captivating and thought-provoking figure in the story.