Like many Catsidhe, Nika chose the path of a professional assassin under "Valo Lana." As an honorable member of Valo Lana, she assassinated quite a few villains, earning herself the nickname "Petal's Shadow" for her distinctive petal-shaped blade. After the Rift Crisis, Valo Lana fortunately discovered an underground Rift and, despite heavy sacrifices, managed to migrate to Earth through it.
However, with assassination being illegal on Earth, Nika quickly found herself without purpose and fell into despair. Introverted and timid, she spent much of her time confined to the house assigned to Valo Lana, with her self-esteem inevitably plummeting. The news of the Bureau of Rift Management recruiting Vanguards offered her a new sense of purpose.
As an expert in assassination, the chance to continue her work meant that she could regain her confidence.
