I think what makes writing Sai so interesting (and especially his interactions with other characters) is not knowing what things he does are his and what's something he's been taught to do (and in the end, if it's something he chooses, does it matter?).
In being a blank slate, everything he does is both deliberate and learned. And yet, is it simply something he's learned in order to appeal to the others? Is it genuine? Does it matter? What is his own personality and what is simply copied, and what traits has he simply pasted over himself? Does it matter, if he's chosen them as his?









