Looks like Observer Alpha; she has the tentacles, the weird multi-gun rigging, and the weird sphere on her right. As well as the same build, hair, and outfit as Alpha. Updated to reflect that, but I could be wrong.

Metr0 said:

Looks like Observer Alpha; she has the tentacles, the weird multi-gun rigging, and the weird sphere on her right. As well as the same build, hair, and outfit as Alpha. Updated to reflect that, but I could be wrong.

You're probably right, thank you for the update.