Rugal Bernstein (ルガール・バーンシュタイン, Rugāru Bānshutain) is a character from King of Fighters. He marks the official debut in the Metal Slug universe in Metal Slug Defense as a Black Noah Campaign boss.
"Repeat this after me: I will never take on a God again!" -Rugal's pet phrase.
On their anniversary website, SNK has stated that Rugal was originally based on the concept of the "mightiest and most evil boss character ever".Like Goenitz and Heidern, his name comes from the anime, Space Battleship Yamato. Toyohisa Tanabe states that his fighting style was created to emphasize Rugal's strength as the series's first boss character. He also comments "going a bit overboard" with Genocide Cutter's damage ratio in The King of Fighters '94.
Their first idea for Rugal's character was that he could learn any move that he saw just once. The developer notes that he was supposed to be "the cheapest bastard ever", but they dropped the idea because they didn't have enough memory to execute it.