The nickname isn’t random, considering that she appears to fight with a scythe, as we saw in the first trailer, if Selvaria is any indication, she’s probably going to play a very important role in the story.
Sega published another direct feed image of Valkyria: Azure Revolution, and this time it shows the Rus Emperor Claudius Powlovich Kiev alongside his pet Valkyria, Brunhild, nicknamed “The Grim Reaper.”