Another character from Atom's subset of them, meet Mark! He's Atom's counterpart in my Age of Wonderbeasts fanfic, as the Mega Wolf.

Born on the streets, he spent the first 5 years of his life surrounded by friendly, homeless people. But around 5 and a half, he was kidnapped off the streets and brought to an illegal genetic experimentation facility. There, he was given the number 0128 as his name and forced to endure long, painful experiments by the scientists in an attempt to create artificial Realital Genes. It wasn't a very pretty time for Mark or the other thousands of kids that had been kidnapped. Over the years, all the others died, eventually leaving Mark as the sole survivor after 10 years. When they next came for him, he snapped. He lashed out and killed the scientists trying to take him in for another experiment and fled the facility, killing anybody who stood in his way as he went! He doesn't remember too much of that day, aside from the sheer rage he felt because of all they had done to him and the other kids.

Upon fleeing the facility, he was tracked down by the owner of it and surrounded by several dangerous, armed guards. After being given an ultimatum of returning as Specimen 0128 or dying, Mark awoke the Artificial Realital Gene that he had gained, declaring that he wasn't just some number, that he wasn't 0128, but that he was Mark. He shifted out and found himself in the Age of Wonderbeasts Realty. He shifted in in Scarlemagne's base, where he was groomed to be Scarlemagne's human knight. But that backfired on Scarlemagne when he kidnapped an entire human underground colony. Mark turned against him and fought back!

Mark, clearly, doesn't like people getting kidnapped, and you'd better watch yourself if you ever try to harm a child while he's around. He can and will kill you without hesitation if he deems it a worthwhile cause.

When the Mega Wolf inside of him isn't out at all, he takes the appearance of a regular human, with semi-tanned skin, brown eyes, and ming blue hair. His usual attire is a red and black shirt with a design on it akin to claw marks, brown pants, and whatever shoes he can manage to find. He had brown eyes, and wields a common Rapier as his weapon. He's not vey proficient with it, but he knows enough to swing it and swing it hard!

On the flip side, with the Mega Wolf, as you can clearly see when it comes to he fur, it's a mix of silver and more ming blue. The Mega Wolf also has black claws. It stands at a staggering 150 feet tall at the shoulder when Mark gets full control over it, sporting 4 brown eyes and two spires on its shoulders that it can use to attack and defend with.

Overall, Mark is a wilder, more dangerous person than Atom, with a strong control over his Mega form, at the cost of a darker backstory and weaker swordsmanship.