John Taylor's Powers (Agents of Light and Darkness)

Three mafia gunmen point their guns at John and start making demands of him. His solution is to teleport the bullets out of their weapons:

And then we both looked up as three large gentlemen loomed over us. They took up positions standing as close as they could get without actually joining us in the booth. I’d heard them coming, but hadn’t said anything because I didn’t want Jude distracted while he was talking about money. The three gentlemen glared at us both impartially. They were the best-dressed thugs I’d seen in some time, but the attitude gave them away. They might as well have been wearing I am a mafioso hit man T-shirts. They looked slick and heavy and dangerous, and each of them had a gun. All three were professionally calm, forming a semicircle to cover both me and Jude, while efficiently blocking us off from the rest of the bar. No-one could see what was happening, and we wouldn’t be allowed to shout for help. Not that I had any intention of doing so. The largest of the three gunmen flashed me a humorless smile.

“Forget the pew-polisher, Taylor. From now on, you’re working for us.”

I considered the matter. “And if I prefer not to?”

The gunman shrugged. “You can find the Unholy Grail for us, or you can die. Right here, right now. Your choice.”

I smiled nastily at him, and to his credit he didn’t flinch. “Your guns aren’t loaded,” I said.

The three gunmen looked at each other, confused. I held up my closed hands, opened them, and let a stream of bullets fall out to clatter loudly on the table-top. They pulled the triggers on their guns, and looked very upset when nothing happened.

“I think you should leave now,” I said. “Before I decide to do something similar with your internal organs.” -Agents of Light and Darkness

The Bedlam Boys turn their immense fear-manipulating powers on John and Suzie. After a brief moment of succumbing, he fights off the effects, claiming it to be "the easiest thing in the world". (P.S.: Get used to hearing him say that)

But even as we stood there debating the point, one of the Bedlam Boys looked round and spotted us. He cried out, and all four Boys turned their power on us, reaching out to the very edge of their range. Their spell fell upon us, and fear stabbed into my brain like so many shards of broken glass. Concentration and willpower did me no good at all.

I was alone, standing in the ruins of London, in the Nightside of the future. I’d been here before, seen this before, courtesy of a Timeslip. A future that might be, of death and destruction, and all of it supposedly my fault. For as far as I could see in the dim purple twilight, I was surrounded by tumbled buildings and seas of rubble. There was no moon in the almost starless sky, and the still air was bitterly cold. And somewhere, hidden in the deepest, darkest shadows, something was watching me. I could feel its presence, huge and awful, potent and powerful, drawing steadily closer. It was coming for me, with blood and worse on its breath. I wanted to run, but there was nowhere left to go, nowhere left to hide. It was close now. So close I could hear its eager breathing. It was coming for me, to take me away from everything I knew and cared for, and make me its own at last. The terrible shadow that loomed over everything I did, that had dominated my life ever since I was born. Close now, vast and powerful. A great dark shape, threatening to unmake everything I’d so painstakingly made of myself.

I knew what it was. I knew its name. And that knowledge frightened me more than anything else. That finally she was coming for me, after pursuing me my whole damned life. It was almost a relief to say her name.

Mother … I whispered.

And in naming my fear, that unknown creature who had birthed and then abandoned me, I was suddenly so full of rage it was the easiest thing in the world to push back the fear, and deny it. My mental shields slammed back into place, one by one, and the dead world around me shuddered, becoming flat and grey and unconvincing. I pushed the Bedlam Boys out of my mind with almost contemptuous ease, and in the blink of an eye I was back in the Hot N Spicy franchise again. -Agents of Light and Darkness

He proceeds to "wrap" his TP defenses around Suzie as well, saving her from the Bedlam Boys' powers.

I’d fallen to my knees on the grimy floor, my whole body shaking with the strain of what I’d been put through. Suzie was kneeling beside me, tears running jerkily down her face from wide, unseeing eyes, lost inside herself. I put a hand on her shoulder, and in that moment I saw what she saw.

Suzie was lying in bed in a hospital ward, held in place by heavy restraining straps. Her throat was raw from screaming. She lunged against the leather straps, but they were far stronger than her. So all she could do was lie there and watch helplessly as her fear crawled slowly, laboriously, across the ward floor towards her. It was small and weak, but determination kept it moving. It was soft and scarlet and barely formed, and it left a scuffed bloody trail behind it as it crawled slowly towards her. It was almost at the side of her bed when it painfully raised its oversized head and looked at her.

And called her Mommy …

It took all my strength to wrap my mental shield around Suzie too, and drag her out of there and back into the waking world. She pulled away from me immediately, kneeling alone, hugging herself tightly as though afraid she might fly apart. Her face was a snarling mask of outrage and horror, tears still dripping off her chin. It was actually shocking to see her so vulnerable, so hurt. I hadn’t thought there was anything that could hurt Shotgun Suzie. I started to reach out to her; then her puffed-up eyes fell upon the Bedlam Boys, and she reached for the shotgun holstered on her back. The Boys gaped at us, amazed that we’d been able to break free from their power. I fired up the dark side of my gift. For a moment, anything could have happened.

And that was when the angel arrived. -Agents of Light and Darkness

The Speaking Gun attempts to control John, and while it has a lot more of an effect on his mind than the Bedlam Boys had, he still manages to shut it out in the end. In reading this, consider just how powerful the Bedlam Boys' abilities were, as well as just how easily John managed to throw them out of his head.

“The Gun, Taylor. Give me the Gun, dammit. Give me the Speaking Gun!”

Her voice was back under control, but her eyes were fey and wild. “No,” I said. “I get to try it first.”

I yanked the case out of my inner coat pocket. I felt unpleasantly warm to the touch. I snapped open the lid and took out the Speaking Gun. The case fell unnoticed to the floor as I stood paralyzed, unable to move even the smallest part of me. My skin crawled, repulsed at contact with the Gun made of meat. It was like holding the hand of someone long dead, but still horribly, eagerly active. It felt hot and sweaty and feverish. It felt sick and powerful. The Speaking Gun had woken up. It breathed wetly in my hand, and its slow heavy thoughts crawled sluggishly across the front of my mind. The Gun was awake, and it wanted to be used. On everything. It ached to say the backward Words that would uncreate all the material world. It had been made to destroy angels, but its appetite had grown down the many, many years. And yet the Gun was dependent on others to use it, to pull its trigger formed from a tooth, and it hated that. Hated me. Hated everything that lived. The Speaking Gun forced its filthy thoughts upon me, determined to control and compel me, to make me its weapon. Its thoughts and feelings were in no way human. It was as though death and decay and destruction had found a voice, and hideous ambition. It knew my Name, and ached to say it.

It took all my self-control, all my rigid self-discipline, and all the outrage raised in me by the Bedlam Boys, to force my fingers open one at a time, until the Speaking Gun fell stickily from my hand and hit the floor, still howling defiantly in my mind. I shut it out, behind my strongest shields, and leaned back against the wall behind me, shaking and shuddering.

The angel was gone. It had seen the Speaking Gun, and that was enough. -Agents of Light and Darkness

John can slip past mental and magical defenses when the time calls for it. His more charismatic abilities also let him get away with this unnoticed.

Part of me wanted to throw myself at Belle and tear her throat out, make her pay for what she’d done. But I couldn’t do that. I had to be smarter, sharper, than that. Belle was armored against all attacks, physical or magical. Or so she thought. My only hope was to keep cool and talk calmly with Belle. Keep her mind occupied, distracted, while I slowly and very surreptitiously focused my gift on her. Do it right, and she’d never even notice. As long as I narrowed my concentration right down, into a single cold needle, I should be able to slip my gift past her mental and magical defenses just long enough to do what I had to do. It was dangerous. If Belle even suspected what I was planning, she’d have my throat out in a second, and to hell with her mission. And even so small a use of my gift would still blaze like a beacon in the night, revealing my presence to those who were always hunting me. So I had to be careful, and focused, and utterly underhanded.

Luckily, I was good at that. -Agents of Light and Darkness

He can find the source of power (magical or otherwise) holding something together and crush it with his mind. In this instance, he finds the magic holding Belle's numerous stat-enhancing trophies together and snuffs it out in a moment.

And while she was still laughing, I hit her with my sharply focused gift, driving it right past all her defenses. I can find anything, with my gift. This time, I found the single small magic that Belle used to hold all her acquisitions together, that made it possible for her to access all their various attributes. And it was the easiest thing in the world for me to tear that magic away from her and crush it with my mind. Belle screamed once as the magic vanished, and her control over her various armors disappeared with it. The werewolf pelt fell away from her back and head, revealing only bare meat showing, red and glistening, with no skin left to cover it any more. The long gloves and boots cracked and rotted and fell apart, leaving bare muscles and tendons showing on her arms and legs. And half her face, the younger half, slipped away from her head, disintegrating into dust. Belle shrieked horribly, half her face a horror show. -Agents of Light and Darkness

Reminder that he's somewhat stronger than a normal human should be.

I stepped forward and hit her once, breaking her neck. She was dead before she hit the floor. -Agents of Light and Darkness

He can find the connection between a person and their ancestor, forcing the latter to possess the former.

“Don’t make me do this, John,” he said quietly. “Please. You don’t know what it’s like, what it does to me. When I call him up, he manifests through me. He takes my place in the world. I have to cease to exist, so he can be real. It feels like dying.”

“I’m sorry, Alex,” I said. “Really. But we don’t have the time for me to be kind.”

I pushed my gift into his head, found the connection that still existed between Alex and his most ancient ancestor, and pushed it hard.

“ Merlin Satanspawn; come forth !”

Alex cried out, in pain and shock and horror, and ran out of the pentacle before any of us could stop him. He got as far as the bar before the change hit him. The whole world seemed to shudder, as reality shifted and changed… and where Alex had been, suddenly someone new, or rather very old, came into the world. -Agents of Light and Darkness

John uses his gift to find and activate the shutdown mechanisms in an army of security robots.

But the robots kept pressing forward, forward, and there didn’t seem to be any end to their numbers. The Collector must have got a job lot. One of them go close enough to take a swipe at me with a clawed hand, and I decided enough was enough. This far from the Nightside, I didn’t have to worry about the angels seizing my soul again. So I opened my third eye, my private eye, and used my gift to locate the automatic shutdown commands in the robots’ minds. I knew they had to be there. The Collector didn’t trust anyone, not even his own creatures. He had to have a way to shut down the robots in case they ever turned against him. I hit the commands I’d found in those clever polymerized cat’s brains, and all the robots froze suddenly in mid motion. A few of them had got worryingly close. Suzie slowly lowered the smoking shotgun, took a deep breath, and turned to look at me.

“You could have done that at any time, couldn’t you?”

“Actually, yes.”

“Then why did you wait so long!”

“You looked like you were having fun.”

Suzie considered that for a moment, then smiled and nodded. “You’re right. I was. Thank you, Taylor. You always did know how to show a girl a good time.” -Agents of Light and Darkness