My Hero Academia: Rise of Ben 10, Book 1.

The Ghost In the Machine.

"H-how do you know about-?" Izuku stammered.

"Midoriya! What is it!? Back away quick!" Tenya roared.

Izuku shook himself out of his stupor, and together with Kevin and Tenya, leaped back a few meters. 

"I know plenty Izuku Midoriya." said Patrick Tennyson. "it has been years since I fought All Might, I doubt he'd recognize my face now after he mutilated it beyond recognition, the surgery to repair my body changed much of my facial features. However, I'm stronger than I was back then. Your mentor was one of the few to give me a real fight."

Patrick's arm muscles bulged, the scars on his body seemed to hiss as steam hissed from around his powerful body. "How long has it been since I've been allowed to let loose hmm? I must admit, I'm getting excited.. Shock Lock, if you don't finish fast enough on your end, I might end up taking your kill."

"Don't be so presumptive, I intend to take quite a bit for my collection later from this third rate old woman." said Shock Lock, licking her lips.

"OLD WOMAN!?" roared Pamela, a vein throbbing near her head. "FUCK YOU! I'LL TAKE BOTH OF YOU TO HELL!"

"So that's her trigger eh?" Kevin muttered, a sweat drop trickling down his forehead. 

Pamela lashed out both hands, and the two of them turned into humungous stone arms, the size of small buildings.

"The Famous Golem arms, said to be able to crush an entire city block with a single swipe." muttered Patrick. "Hmph, irritating, but not troublesome. Shock Lock, do your job."

"Tsk, you're the one with the easy task, you've got those dimwitted kids." Shock Lock said as suddenly multitudes of more Octopus tentacles exploded out of her hair and created a massive barrier that blocked the massive stone punch that Pamela threw out. 

"She managed to cushion my most devastating attack?" Pamela muttered. "Just what are those tentacles made of to be so highly impact resistant?"

"Don't put me on the same tier as all those third rate villains from the League of Stupid!" Shock Lock said with a laugh. "The only reason my Master Overlord even bothers with those twits is because of Shigaraki! That boy's got massive potential you know! Even if he's weak as shit right now! Ufufufufufufu! KRAKEN BARRAGE!"

Shock Lock sent forth a thousand punches at once as her tentacles all curled into fists and unleashed a flurry of blows.

Pamela immediately covered her body in black scale-like armor, crossing her arms together to endure the blows.

"Sh-shit.. I'm even feeling the attacks through my C4 Bunker armor!?" Pamela growled as the scales began to crack. "The muscle power on her tentacles are no joke either! Any single protection type Adaptation I've collected might not be enough here!"

At that moment a slight static charge crackled over Pamela's body.

"Eh? That again..?" Pamela muttered. 

"Hmph, it seems that Shock Lock has her under control." said Patrick as her popped his neck and began cracking his knuckles. "Well lets see.. it's been a few months since I last flexed these muscles. How about we start with a warm up?"

Patrick pointed at Tenya. "You first boy, you seem athletic. Lets see how thoroughly you've trained. 

Tenya gritted his teeth, sweat pouring down his face. "D.. damn it.."