Robo-Manus is a "mutant biogen", a cybernetic mutant who appears in practically every Battletoads game as a boss, and twice as the final boss. He is one of the main henchmen of the Dark Queen.
Robo-Manus almost constantly changes size and appearance, although he usually retains some features: a black metal skullcap and a visor through which he sees (and shoots laser beams from in Battletoads and Double Dragon), often with an oscillating red or purple light. Cracks on his helmet reveal what appears to be his brain. Another common feature is the set of metallic orbs that he can swivel his head on in most of the games. Robo-Manus has tentacles, though they are never seen in the game. As the series progressed, Manus began to receive more changes in his appearance, particularly to his face. Rare made Manus considerably less alien, and gave him more human-like features. Manus' visor also changed, and featured two red eyes. Since Robo-Manus is part robotic, he can survive space and can be rebuilt. Manus was depicted with wings in the intro of the first game. He is able to fly later in the series. He is the result of heavy genetic and technological experimentation. According to the Battletoads manual, he is "a genetically enhanced biogen mutated by the forces of darkness", suggesting he was mutated by the Dark Queen's evil powers.
Robo-Manus, just like General Slaughter and Big Blag, some of the Dark Queen's other top lackeys, never appeared in Battletoads in Battlemaniacs. He appears to be killed in Super Battletoads, though he does manage to growl "I'll be back!" in his death sequence.
Read more about this topic: List Of Battletoads Characters, Villains