Hakku is a character of a video game my friend and I are working on (he's director, I'm character designer, co-director, voice actress, and 3D modeler x.x).

She is my pride and joy...

Hakku's scar reminds her of the tragedy that befell her mate, Kilaki. She saw him be eaten alive by a pack of Hellhounds (more on them later), and as his last attempt to save her life, he told her to run as fast as she could to escape the facility that would have decommissioned her (basically the machine breaks up your DNA and slowly breaks you apart....painfully...). She ran, but a hellhound got to her and scratched from her bellybutton to her spine, leaving a huge gash.