Atago

A clear Onee-san type. Ironically, she's not actually the eldest. She's also trying to become one to the Commander too, and aggressively so. Has no issues drawing attention to her good looks. She even attempts to give sexy photos of herself (including one apparently nude picture) to the Commander, only failed due to Commander being on extended leave from overwork and Queen Elizabeth's intervention.

Her acting like a big sister to all three of her sisters despite not being the eldest is most likely a reference to the fact that she was the first one to be commissioned.

A foil to her older sister Takao, more or less. Takao is formal and strict, Atago is more easy-going and informal. Takao speaks in archaic and traditional style, while Atago speaks more or less normal and modern. Takao is a bit shy regarding normal interaction, and Atago is... not.

Atago is a dog girl, with ears similar to a shiba inu's. She also probably has a tail, but no one actually knows if it is true. She wields a katana like her sisters, and she is only 2nd best after her sister Takao in using a katana.

She can gobble up a copious amount of rice bowls without much problem and can still keep on going.

According to Takao, Atago is afraid of ghosts. She's not good with scary things in general, as she was knocked unconscious after seeing a horror movie.

A massive shotacon, she is a little more possessive towards the commander.