Ancient War Droid
This is an ancient War Droid harrassing a young Jedi. It has two primary functions: Search and Destroy. It is programmed to follow tracer beacons and hunt down ships through deep space, with a primary mode similar to that of a Probe Droid or a Trade Federation droid starfighter. Upon reaching its designated target, the droid 'transforms' into a walking mode, revealing its deadly arsenal.
One hand has large pincers, the other a large blaster cannon. The four arachnid-like legs make it move easily over various terrain and the forelegs also have small but powerful pincers that can crush a human. The top half of the droid can pivot from side to side and up/down. The circular shapes above the arms are mounting brackets for mission-variable equipment and armament.
In flight mode, the Droid's legs fold up and the hip socket retracts into the main body. The arms fold in and the thrusters extend while the tail folds down and out. The transformation is quite fast and quite fluid, even for such an ancient droid.
This design was inspired by Sea Crabs, with a little manga influence and also Steve Burg's unused 'HK Centurion' design from Terminator 2.