Nursery described him as "not as scary as you pretend to be ... just a man who's dressing up". Also that he has a rookie mindset with good instincts. He's mean, unkind, impatient, emotional.
His normal speaking voice is a deep growl.
As with his clustermates, his original personality is warped. This is due to the bleed-through effects from the tokens they pass around. Cradle had made a concerted effort to pass his sociopathy to Snag, making him much more cold blooded and ruthless. Upon his death, Cradles influence over Snag stopped and Snag saw the error of his ways for the first time.
Snag was heavyset, 250-300 pounds and less than six feet tall. He had long black hair and a thick beard. He speaks with a raspy voice generally lowered in a growl; evidence of persistent damage from smoke inhalation.
Before his trigger he was much heaver then he is now. Even then he had lost weight due to eating and similar.
He wears what appear to be long-fingered gauntlets, and features mechanical arms long enough that his wrists can brush the ground.
By way of a costume, he wears metal work boots and a long coat that drapes down to his ankles, with sleeves modified to reach almost to the floor. His face is covered by a crude mask made of what looks like black clay or melted rubber, covering the skin not concealed by his hair and beard. His eyes had dark circles under them that blended into the material of his mask. This gives him the appearance of a neanderthal brow with a permanent glare.
He can treat any direction as 'down', that allowed him to leap without jumping movement, land on a ceiling or on a wall. In open spaces Snag was capable of pseudo-flight, although he had to be careful about velocity.
Snag's Tinker ability manifested in a way that allowed him to create large gauntlets that fit over his arms.
Artifi-Arms V1 - His arms were at least partly mechanical, and could be damaged or destroyed without injury to him. They would sometimes "detonate" (without physically exploding) if damaged, creating a powerful charge of negative emotion for those nearby.
Artifi-Arms V2 - Second pair of arms he used were much more varied with a comunicator and others goodies.
Trap - On one occasion a device resembling a gauntlet with attached electronic arm was left behind, presumably by Snag, with clawed fingers embedded in a door and door frame. His group claimed that this device was a bomb and would detonate if the door was opened, but its precise abilities are unknown. It seems likely that this was a spare of the same extended arms he wears.
Missiles - He kept chunky, explosive shurikens in his boot. When they detonated, they were accompanied by an emotional charge similar to his gauntlets.
He was looking to hire people for a project, presumably to find the rest of his multi-trigger group. He wants to do test runs to ensure he succeeds on the first try. He has hired Tattletale as an information broker for the job. 
↑ 1.01.1The force of people behind him pushed him forward, as heavy as he was. He was a big guy. Big around the middle, more. Only a bit taller than average. It was enough that he could almost see over the heads of the crowd. [...] The memory had been Snag’s, and Snag was the first to really move. Snag wasn’t as big as he had once been. Still tall, but he had lost a lot of weight. The beard he’d had before was longer now, shaggier. So was his hair. There were streaks of paler hair at the corners of his mouth. The hood of a sweatshirt and the lack of clear lighting masked much of the man’s face, so only the beard was visible. - Excerpt from Interlude 4a II
Anger flowed freely, then found it had nowhere to go and nowhere to settle.
He was alone in the room, and for once, there was none of the chaos. None of the jostling or noise, no babble, no overflowing emotion.
He felt like himself again.
No anger, no numbness. He missed his brother, his store. Was it that the connection had been severed, or that this mad quest had ended? His time as a cape was over. There was no going back. Interlude 5y II
↑Beside her was Snag. He was heavyset. Two hundred and fifty pounds, at least, possibly three hundred pounds, and he wasn’t quite six feet tall. That mass was made even bulkier by his coat, which was fastened closed, draping down to his ankles, where his boots were. The sleeves had been modified to be longer, fitting the arms, which reached to the floor.
It was my first chance at seeing his face, though. He had long black hair and a thick beard, both in the loose heavy-metal take. His mask looked like he’d taken handfuls of black clay and layered it over the skin his hair and beard didn’t cover. The mask created a kind of neanderthal brow with a permanent glare built into it; the circles under his eyes were so dark it was hard to tell exactly where the eyeholes of the black clay mask started. It might have been thick rubber, melted to be in the crude shape needed, the texture left unrefined. - Excerpt from Daybreak 1.5
↑“Tell me the details,” Snag said, his voice growl-like even when he wasn’t threatening Nursery. - Excerpt from Daybreak 1.5
↑His voice distorted on that last word, rougher, painful to make the word ‘feel’.
“You feel what?”
“I feel,” Jonathan said, in that painfully rough voice, “Hollowed out. Numb. Angry. Lost.”
“Yeah. Me too.”
“My voice-” he said.
“It changed just now.”
“It changed on the day. Smoke inhalation. I’m not wondering why it’s different. Why was it normal?” - Excerpt from Interlude 5y II
↑ 11.011.1I passed through the doorway, pursuing, and my head turned against my will. I heard glass break, saw Snag vault through the window he’d broken.
He was nimble, for a guy that big, but it seemed his mover power did the bulk, his mechanical arms helping with the legwork. He was strong in many respects for what I was gathering was a multi-trigger. Robust tinkerings, what felt like a full-fledged emotion affecting ability, a decent mover power. - Excerpt from Daybreak 1.6
↑His mover power let him treat any direction as down, with some nuance when it came to propelling himself forward. - Excerpt from Interlude 5y II
↑He touched the ground with one foot, then changed trajectory. Dust fell from the ceiling as he landed on it, upside-down, his arm still extended my way. - Excerpt from Daybreak 1.6
↑He sprung back using his mover power, landing with one hand and one boot near the ceiling and another hand and boot beneath and on the window as he clung to the wall. - Excerpt from Daybreak 1.6
↑In the gloom, the Fallen shithole and the battlefield were small below, lit by tiny points of light. <>br>He controlled his descent, falling, but not at a velocity that would hurt him, not if his arms took the landing.- Excerpt from Interlude 5y II
↑ 17.017.1His hands freed, he reached back to his boot with one gauntlet.
He threw a trio of fat shurikens at me. My forcefield blocked them, saw them bounce off, one landing on the bed, two falling to the floor beside me.
I kicked the bed to bring the more solid bedframe to where I could grab it, and rammed the end of the bed at the corner where he was. The shurikens detonated behind me, and on the bed in front of me. Something that wasn’t fire or anything of the sort. Something jumped between them, like electricity but not. Where it touched me, my heart jumped, my mind stumbled, and feelings welled. - Excerpt from Daybreak 1.6
↑In the same moment I turned my thoughts to Snag and his disappearance, two mechanical arms stabbed out of the nearest wall as if the wall was paper. One hand caught me around the neck. The other across the face. I was slammed into the window, hard enough to shatter it and take out my forcefield. Glass tinkled onto my head, into my hair, and all around me.
Before I could get my bearings, he hauled me into the wall. My head cracked into the drywall and I felt it break with the impact. His hand gripped my mouth and the length of his long forearm caught me around the throat.
I put my hands on his arms, and I felt the whir as machinery kicked into life. - Excerpt from Daybreak 1.5