Lutgalnikov

She is a trigger-happy little girl, who happens to be a soldier from the Krakozhia Dukedom, she holds the rank of 1st Lieutenant and is armed with a Remington 870 pump action shotgun, though sometimes she would be seen holding other kinds of weapons like M20 "Super Bazooka." She and her subordinate Haruka were under orders to protect Souhei from assassin of the Grania Republic. She and Haruka drove what looks like a T-34 Russian tank which they've used to barge into Souhei's house.

(Source: Wikipedia)