[quote=@Sierra]As for name, the professional, appropriate answer is to call her by her surname as Takeda-san. "Kira" is predominantly a nickname derivative of her forename. Anyone can use it, but few people can use it [i]and not get shot in the throat[/i].[/quote]
And anyone calling her 'Kira-tan' can expect to wake up in a dark, windowless chamber where they'll slowly be killed over the course of several excrutiatingly painful weeks?