Listened to her voice lines, she's definitely the genkiest (until weevee shows up) among the big seven much like her abyssal counterpart being called an imouto. Somehow make sense being the youngest among the Big Seven based from their launch dates.
Nagato: 9 November 1919 Maryland: 20 March 1920 Mutsu: 31 May 1920 Colorado: 22 March 1921 West Virginia: 17 November 1921 Nelson: 3 September 1925 Rodney: 17 December 1925