Nope, nor me. On the contrary, she seems to be the epitome of all that's cute, practically unto the point of annoyance. Give or take the murderous gaze and scribbling. That's not so cute. It just makes for a great story.
Neither do I consider the likes of Hal or Naomi to be particularly conceptualized on the page.
Yet their artist doesn't share our view.
Takeshi Obata gave an interview to Juliet Kahn of Comic Alliance, during his recent trek to the United States. There's not a great deal of focus upon Death Note, so I'll not wax too lyrical about it here. But there was an intriguing comment about his art.
CA: Is there anything you especially love or hate to draw?
TO: I’m really bad at drawing female characters. It’s difficult to capture their expression because I don’t understand them! Making them pretty and cute is the most difficult thing.
(Takeshi Obata, with Juliet Kahn, Comic Alliance, October 30th 2014)
There's much more in the interview, though it's mostly about All You Need is Kill and Bakuman. Visit Comic Alliance for the full low down.