And if you're wondering where the turrets and rigging are, those black... Neo Armstrong Cyclone Jet Armstrong things behind her are her rigging and turret. Tentacles as well.
This siren has a proper name, just fyi. This one is "Tester-Beta", with the one she's always with in cutscenes (and the one fought as the final boss of the Tirpitz event) is "Tester-Alpha".
This siren has a proper name, just fyi. This one is "Tester-Beta", with the one she's always with in cutscenes (and the one fought as the final boss of the Tirpitz event) is "Tester-Alpha".
In the current event she was called "Observer", "Tester-Alpha" (Mikasa event) and "Tester-Beta" (KMS event) share the same model, at least on JP on both JP and CN (CN KMS, Mikasa).
Another edit: this girl was called "Observer-Alpha" in the Fallen Wings event as well.