Thus far, there have been four individuals with the name "Nemesis Prime".
The first being an evil clone Optimus Prime from Transformers Armada.
In this series, he was a monstrous 'puppet' controlled by Sideways and Unicron. He attacked both Autobot and Decepticon alike, wielding a powerful dark copy of the Star Saber sword (called the Dark Saber in the Japanese version, but given the U.S. name of the Vorpal Saber by the TFCC to differentiate it from the
other Dark Saber, which was just the Star Saber turned evil).
It took the combined efforts of Optimus Prime (merged with Overload) and Megatron (using the Requiem Blaster) to destroy him.
The second was an evil clone of a deceased Optimus Prime from an alternate universe. This Nemesis Prime originated from the 2003 Universe toyline, but played a more prominent role in the Cybertron comics (he dimension-hopped to get there).
He was created by Unicron to be one of his generals and worked alongside Ramjet, another of Unicron's minions. He possessed a deadly artifact known as the Dead Matrix, which he sought to use in an attempt to kill Primus's spark. But, his plans were thwarted and he was killed by RiD Optimus Prime and RiD Ultra Magnus, who were shortly teleported to this dimension at some point.
However, This Nemesis would be resurrected, but on the side of good. While maintaining his brutal attitude, he was made into an Autobot as one of the Alternity.
He's still a hardcore character, even if he's no longer evil.
The third character was yet
another Optimus Prime clone. This time as a clone of G1 Optimus Prime in the Alternators/Binaltech story.
Created by Doctor Arkeville with a fragment of the Universe 2003 Nemesis Prime's spark (obtained via some time-spacial pocket dimension technobabble source or whatever
), this Nemesis assumed command of the Decepticons from Megatron after Megatron had been deactivated by the killswitch from the G1 Five Faces of Darkness 5-part episode. However, he met his end when Optimus, empowered by the spark of "The Protector", redirected an attack sent by Nemesis back at him, making his body explode.
The fourth and final Nemesis Prime was not a clone, but instead a corrupted version of the character of Nova Prime from the IDW G1 comics.
In the past, Nova Prime was a great leader who had disappeared in an anomaly along with the crew of the Ark. Thought to be dead, he was possessed by the dark forces of the anti-Matrix, the Darkness, which ruled the Dead Universe. His plan was to merge the Dead Universe with the real one, in order to return home and bring order to this new universe. However, eventually he was shot by Galvatron and the Darkness passed onto Optimus. Galvatron wanted the Darkness for himself, so he made Optimus pass it onto him… before Optimus tossed Galvatron and the Darkness into a solar pool that would have destroyed both Galvy and the Darkness (but each survived somehow).
Aside from those four, there have been other characters that are similar to the Nemesis Prime character, but are not Nemesis Primes.
One such character was Black Lio Convoy, who was a clone of Lio Convoy from Beast Wars II.
Created by a device that could make evil copies of object or Transformers, he attacked the Maximals in one episode and created evil copies of Bighorn, Tasmania Kid, Apache and Scuba. However, one Maximal, Diver, had been absent. Diver used the weapons of his Niagara Base to bombard and destroy the other black Maximals and both Kid and Lio Convoy destroyed the copy machine, causing Black Lio Convoy to fade away in pain and rage.
Another character, and probably the most famous, coolest, most popular, and most successful one of the all, was Scourge from Robots in Disguise. While being a clone of Optimus, he was more than just a lookalike.
Scourge was the leader of the subgroup of Decepticons serving under the command of the Predacon Megatron (I am not kidding with this). Unlike the others like him, he was a loyal soldier and a very competent one at that. He could easily hold his own in battle and wouldn’t fall so quickly. He made several accomplishments in the series and the main reason he ever failed was due to whatever interference he received by the jealous Predacon sub commander Sky-Byte (who believed Scourge was trying to outrank him). Eventually, Scourge did become the more favored soldier of Megatron’s, but Scourge also developed a treacherous streak. He secretly plotted to take command of the both the Cons and Preds, and once Megatron was seemingly destroyed by the Autobots, he did. However, once Megatron returned as Galvatron, he returned to hiding his plans for glory and resumed faking his loyalty. However, he soon gained control over the mighty Autobot Fortress Maximus. With this seemingly unlimited power at his fingertips, he made his move again to usurp Galvatron. However, due to the Autobots thwarting both his and Galvatron’s plans, Galvatron took disciplinary action on both Scourge and all his Decepticons, wiping their memories and making them mindless, loyal followers of Galvatron, Sky-Byte, and the other Predacons. He, along with all the Cons and Preds (except for Sky-Byte) was eventually captured by the Autobots and taken to Cybertron to meet his fate with the Autobot hands of justice.
Another one was Grand Scourge, a redeco of a model kit of Energon Optimus Prime.
He only appeared in some pack-in fiction that came with his model, so there’s not much known about him. Although, since his name is Grand Scourge, some think he might be related to Armada Nemesis Prime (whose Japanese name was “Scourge” also).
There’s also Shattered Glass Optimus Prime, who’s a naturally evil Autobot.
And there the first ever Optimus Prime clone.
And of course, there’s Motormaster, the first evil black truck rival for Optimus Prime.
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