The original Harbinger operated for a long time and had a reputation if not outright legend about him. While legends contain grains of fact they are on the whole fictional and not the best basis of research.
The Harbinger Clones were created by Bonesaw, as a part of the Slaughterhouse Nine-Thousand. They proved a force to be reckoned with, and were only defeated by the combined forces of the original Number Man, and Contessa.
↑Though it’s somewhat justified in this instance as they don’t retain their full memories – only cobbled-together personalities and histories. - Comment by Wildbow in Sting 26.3
↑ 4.04.1The entity observed the ongoing conflict. No less than five seconds after it had been trapped, two figures had emerged from a doorway between worlds. The entity could see the paths forming, trace them back to the source. Another world, a living world without a shard occupying it.
They engaged the eight with their own perception abilities, intervening to assist a group of others. As a pair, they opened fire with guns, then waded into hand to hand combat.
The entity looked at the male, and it saw the connection to the same shard as the eight. His connection was stronger, more mature. [...] The fight progressed. Strikes with weapons and with the creature’s limbs were evaded, a careful dance of attacks where each edge and bludgeon touched skin, many even shaving off the finer hairs from cheeks, noses and chins.
The male fought the eight in such a way that they couldn’t move without exposing themselves to attacks from the female. Each movement placed the male in a path for obvious harm, a fatal blow, but the eight could not capitalize on that. At the same time, he positioned himself in such a way that four or five at a time were unable to retreat. Not just in reach of weapons, but in reach of arms, elbows, for being taken hostage.
The female felled three of the eight, and the situation was decided. The remaining five dropped to a position where they sat on their knees. She spoke, and an interdimensional portal appeared behind them.
↑"I'm sorry," the Number Man said, to Rachel. "For the behavior of my clones. They're inaccurate, based on hearsay and speculation more than fact. I was more polite, back then, more efficient." - Excerpt from Venom 29.7
↑“He’s on our side,” Sveta explained. “He left them during the attack on Teacher’s base. He went off on his own. They’ve tried to track him down a few times. He gave up a lot to be here.” - Excerpt from Interlude 19.a II