The spider will charge at you without any thought, and doesn't show many other personality traits. It is giant, almost as tall as your Poptropican, and twice as wide. It is green, possibly due to the radioactive green goo in barrels down in the sewers. It has eight legs and four eyes, with visible mandibles.
While its story is not completely told, you can purvey from the appearance in the island that it stole the Prized Porker from the Pilgrims. It then took it down into the Pit, where it guards it until you take the pig from it as it crawls on the floor
In its appearance, it scuttles back and forth on the bottom of the Pit. It will harm you if you touch it, but won't automatically pursue you.