Master Sliver

Sliver is a villain from the Teenage Mutant Ninja Turtles franchise, a dark and corrupted counterpart of Master Splinter who is as ruthless and cruel as his mainstream self is kind and wise.

Mirage
The brilliant but conniving Dr. Shreddarius created The Terrorkinetics. These robotic protectors were commissioned by the corrupt Chairman Lucks to defend the Earth from supposed alien Invaders. In reality, they were constructs of evil design.

Lucks, a World Unifying Leader, had a definitive hold on this universes' power and was untrustworthy. Shreddarius' own private experiments included four Turtle Super Soldiers in case Lucks decided to double-cross his scientific friend and betray their common beneficiary: Griddex, Blobboid, Graviturtle, and Shellectro, who would eventually band together as The Super Turtles. However, the chemicals and experiments eventually became unstable, and an explosion rendered Shreddarius severely disabled. A somewhat familiar lab rat licking the wounds and absorbing the chemicals on Shreddarius would mutate into the militant master, The Sliver.

Unlike the warm, caring, nurturing, disciplined and kind wisdom and love conveyed to the Turtles by Master Splinter, Master Sliver is cold and relentless in his teachings. A harsh taskmaster, his treacherous methods in training Shreddarius' Super Turtles almost destroyed them numerous times in the insane effort for them to become the ' Ultimate Soldiers`.

Two rebel leaders, Case and O'Malley, would convince the Super Turtles of the truth behind Luck's evil, twisted hold on power and Shreddarius' subservience to maintain it. Sadly, Master Sliver was so blindly obedient to mad Doctor, he would not waiver that loyalty. Defeated briefly by his former students in time, yet independent from his Master Shreddarius, The Sliver would return more powerful than ever.

2003
In another universe, where the Turtles are superheroes instead of ninjas, their master, referred to as the Sliver, was initially their foster father but was eventually corrupted by evil. When Michelangelo was stranded in this parallel dimension by the fused Ultimate Ninja and Drako, Sliver was planning to wipe out humanity with the Penultimate Nullificator. However, because the device destroys all life on the planet, the Sliver modified it so that his tower and everything inside would be spared. He also planned on turning the Super Turtles to the side of evil once the Nullificator was set off, catching them in a Utromidium cage that proved impervious to their powers.

However, Michelangelo, who had accompanied the Super Turtles, came up with a plan to set them free. By having Blobboid pose as him, he tricked the Sliver into thinking that in Mikey's home universe, he and his brothers ruled the Earth and that they were loyal to their master. When the Sliver released 'Mikey', Blobboid revealed himself and snatched away his control cane, releasing the other Turtles from the cage. Unfortunately, the Sliver had the same powers the Super Turtles had and had mastered them to a degree which made him superior to his students.

With the Super Turtles quickly incapacitated, Mikey was left alone to face the Sliver. Using his ninja skills, he trapped the Sliver in his own cage, but the Nullificator was still set to go off. Luckily, Mikey figured that they could reverse its function to go off inside the tower. Shellectro managed to reprogram the device, and the Super Turtles escaped before the Nullificator destroyed the tower with the Sliver inside it then went to another nowhere, while Mikey was pulled away from this dimension by the efforts of his brother Leonardo to reunite his family.

His armor is very similar to the Shredder's.

Trivia

 * Born to another universe Sliver wanted to destroy humanity and turn his students into monsters like himself - which in some ways makes him comparable to the Shredder of the main world (especially the Utrom Shredder).