Lina Inverse
She's not from "Slayer" manga
but she's from "DotA" computer game

::information from wikipedia::

Defense of the Ancients (often referred to as DotA)
is a custom map for Warcraft III: The Frozen Throne, based on the "Aeon of Strife" map for the Blizzard title Starcraft. It is a team strategy game focused on hero combat. The objective is to destroy the opponents' base using one's own Hero along with allied heroes and allied AI-controlled fighters called "creeps". Sharing concepts with role playing games, the player levels up their hero and uses gold to buy equipment in an effort to best the opposing team.