Bug-Eaten is a minor antagonist in Diamond is Unbreakable, a brown rat turned into a Stand user by Akira Otoishi's Arrow. Armed with the sniping Stand Ratt, it is hunted by Jotaro and Josuke before it can breed a swarm.
Bug-Eaten is a brown-furred rat about twenty centimeters long, marked by an odd lump on its forehead and an unusually large nose. One of its ears was gnawed away in a scrap, and that chewed ear is what earned it the name Jotaro gives it.
Made bold by its Stand, the rat is aggressive and cunning, pressing the attack against Jotaro and Josuke and confident enough to hunt and kill humans for food. It is cleverer than a rat has any right to be, pulling off basic hunting tricks and sniper tactics such as shifting position constantly or bouncing its darts off obstacles to strike from angles its prey cannot see.
Its Stand, Ratt, takes the shape of a robotic, rifle-like weapon that fires corrosive darts from more than sixty meters away, and the acid they carry eats through almost anything, melting Jotaro's arm in seconds. The rat gained this power when Akira Otoishi, then holding Keicho Nijimura's Arrow, tested the weapon on two rats and pierced them both.
Learning of the danger from the defeated Otoishi, Jotaro and Josuke set out to hunt the rats down before they can breed a whole swarm of Stand-using vermin. Following a drainpipe to an empty house, they find one rat in the kitchen trying its power on humans, and Josuke swiftly kills it, only to be caught off guard by a second, which Jotaro dubs Bug-Eaten. The battle moves outdoors into a standoff, with neither side willing to leave cover, until Josuke baits Bug-Eaten out of hiding and shoots it dead.

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Jotaro names the brown rat Bug-Eaten because one of its ears was chewed away in an earlier scrap. That gnawed ear is the detail that earns it the nickname.
Bug-Eaten's Stand is called Ratt, a robotic, rifle-like weapon that fires corrosive darts from more than sixty meters away. The acid in the darts eats through almost anything, even melting Jotaro's arm in seconds.
Bug-Eaten gained its Stand when Akira Otoishi, then holding Keicho Nijimura's Arrow, tested the weapon on two rats and pierced them both. This turned ordinary rats into Stand users capable of hunting humans.
Jotaro and Josuke learn from the defeated Akira Otoishi about the danger the Stand-using rats pose, and they set out to kill them before the rats can breed a whole swarm of Stand users. They track the rats through a drainpipe to an empty house.
After Josuke kills one rat in the kitchen, Bug-Eaten ambushes him, and the fight moves outdoors into a standoff. Josuke eventually baits Bug-Eaten out of hiding and shoots it dead in 1999.
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