In many fantasy works, such as those of J. R. R. Tolkien, orcs are very ugly humanoid creatures that are fierce and warlike. They originate from Tolkien's writings and they ride on boars or wolves. Their name is said to come from the Roman chthonic god Orcus.
"Origin: Italy. Pig-headed demons that serve Orcus. These demi-humans of the Expanse are very close to humans. They think of nothing but their appetites and sexual desires. They often attack human settlements for food and women."
—Shin Megami Tensei A-Mode DDS Dictionary
An Orc can be seen in a lab in Shinjuku, greeting the Protagonist & hisfriends, mistaking them for demons in a human disguise. He then realizes that they are actually humans & fights them. Another Orc can be encountered, saying "Where did you come from!?"