Eraser is mechanoid lifeform. Unlike other mechs he can't understand the concept of organic life. He has a limited intelligence and know nothing about his origins or nature. He sleeps in some abandoned laboratory as incompleted imbecile. Being waken (be researching special place naturally) he sees the world full of creatures not unlike him - spaceships. Those creatures, however, are mostly sick with corrosion of parasite organics. So Eraser wants to purge his brothers. After destroying ship's shields he attacks it with close-range radiate unblockable attack and kills everybody on board. So the ships is not destroyed (just damaged) and can be "repaired" like other damaged space objects.
What it looks like
It's basically robot vampire in space so it would be logical to give it bat-like appearance, maybe something like included picture.
What it does
Eraser seeks out for ships and stations and deactivates them, never destroying them. He doesn't attack mechanoids (and so they want attack him) but he doesn't communicate with them in any special way.
Gear
He has random standard ship weapons plus special weapon with very short range which basicaly makes any ship without shields damaged and unfunctional. He has rather low speed so he will rarely do any significant damage to passing ships, his primary targets are stations and fleets defending those stations.
