Disgaea®4: A Promise Revisited

Desco

Her official name is "Final Weapon: DESCO." There was only one reason for Desco's birth: To become the Final Boss. However, she was put in solitary confinement in Hades before she ever saw the light of day. After fighting Valvatorez, she starts calling Fuka "Big Sis."

Desco is gonna become a magnificent final boss. I hope I will have your blessings, Big Sis!