A Mettaurs can be many things. Viruses like the Mettaur are usually a malicious or corrupted program that disrupts the operating system of cyber network of electronic devices. There usually encountered as enemies in the Mega Man battle network series and the anime. They search for Netnavis and other programs to delete or mess with. Some viruses are man made or wild. Mettaurs like other viruses are not inherently evil despite their negative and hostile nature.