Greta introduces herself to the player and fights the player as a revenge for what the player has done to Gizmo.
- Main article: Big Sister
Greta is fought as an enemy in Chapter II. Player must win two rounds in order to win. She wields Arbitrator as her weapon, and utilizes an exclusive ability and three Shadow abilities.
- Greta utilizes an unavailable special move, the same move used by Gizmo in the boss fight with him.
- In the closed beta-test of Shadow Fight 3, Greta played a more significant role in the story. She was a major character in Chapter I, where she continuously opposed Sarge and his Shadow Squad, and was fought as the first boss of Chapter I. She was shown to extremely despise Shadow energy to the point where she refused to use it in battles.