Complete Monster/Great Mazinger

The Mazinger trilogy - Mazinger Z, Great Mazinger, and UFO Robo Grendizer - is rife with villains who are utter bastards. Given Go Nagai's penchant for Crapsack Worlds and Downer Endings, it should not be shocking. However, many of them fall into the Woobie, Destroyer of Worlds or Well-Intentioned Extremist categories or have a Freudian Excuse or some redeeming qualities (most of them avoided Bad Boss and You Have Failed Me scenarios; Dr. Hell sincerely cared for his henchmen even if they frustrated them, and as bastard-like as King Vega was, he sincerely loved his daughter):


 * Marquis Janus was a witch who was more than willing to befriend people under disguise before poisoning them. Another of her acts in the Gosaku Ota manga episodes was to pay Tetsuya back for defeating her in a fair fight.
 * Great Marshall of Darkness was downright cruel, specially in the Ota episodes: His first strategy was blowing up one city, and then warning he would do the same thing in Tokyo unless the Japanese Government destroyed the Fortress of Science and Great Mazinger. The Government caved in... and then . And another of his plans involved creating a Kill Sat to blow up any from the space any target he felt like annihilating. You can say