Saitama vs All Might and Deku

"Well, blondie, how do you know it was me who blew up those buildings?" Saitama asked with feigned offense. "I mean, it could have been anyone. Why, I could be a hero myself, for all you know."

"I was teaching a class outside and happened to see the explosions, so all I did was jump towards the source," All Might replied as he took another step forward. "I don't know what your quirk is, but it's dangerous. This is your last warning, surrender now, or I'll be forced to subdue you."

"Subdue me? How about you DUE your worst!" the bald clown laughed as he crossed his arms and stood defiantly before the towering hero. "You'd better hurry up, because I feel like blitzing a few more buildings."

His smile briefly fading, All Might charged towards Saitama and was upon him in the blink of an eye.

"Texas Smash!!" the muscular hulk yelled as he threw a massive punch towards the caped man. A hurricane-force wind blew through the alley and knocked down Harley Quinn, who'd just gotten up again, as All Might's fist was promptly caught in one of Saitama's red-gloved hands.

From behind his darkened eyes, Japan's number one hero stared in awe at the man who'd just effortlessly stopped one of his attacks. Pulling his arm away, he readied himself for another.

"Well I'll be, that doesn't happen too often!" All Might exclaimed as his smile returned, before he launched a sudden uppercut at his bald opponent. "Louisiana Smash!!"

Saitama merely moved his head around half an inch at the last second, causing the powerful blow to shoot harmlessly into the sky, where it parted several clouds on the way up.

"Pffffttt weak!" the bald clown mocked as he made a farting noise with his mouth. "All Might? More like, you only MIGHT hit me!"

"All Might!!" a young man's voice yelled.

Two teenage males who were dressed in what appeared to be school uniforms suddenly appeared from the other side of the alley. A taller one with dark hair and glasses was running extremely fast while carrying a shorter boy, whose head was topped with messy green-black hair.

"Y-young Midoriya! And Mr. Iida? What are you boys doing here?" All Might replied nervously as he spotted the two kids. "This is a dangerous villain, you guys need to get back to U.A!"

"All Might, you've been teaching all day, don't you think you're a little tired?" the green-haired boy asked, where he began sporadically winking at the towering hero as if he was trying to insinuate something.

"I'm sure he's fine, Midoriya, he's All Might!" The taller teen replied to his friend, where he began to bow repeatedly towards the blonde hero. "Anyway, sir, we're sorry for following you out here, but after our recent encounter with the Hero killer, Stain, we made it a point to never confront a villain alone!"

"Hey, pay attention to me, blondie! Saitama jeered with a wide grin, before rearing his arm back and throwing a simple punch towards the muscular man's chest.

The two children could only stand and watch, stunned as All Might was sent flying backwards from the blow, where he promptly flew through several buildings before an explosion of dust and brick hid his body from sight.

"ALL MIGHT!!" the teens screamed with concern, where the green haired one immediately clenched his fists and started towards the caped baldy.

"Oh? Are you a hero too, kid?" Saitama asked with a grin as he watched the boy sprint towards him. "You know what? HAHA I wanna see what you got, hit me with-"

"Smash!!!" the teen yelled as he threw a punch right into the bald clown's stomach. Saitama didn't dodge, he purposely allowed himself to get hit solely to see what the young man was capable of, and he was surprised to be sent flying backwards similarly to what he'd just done to All Might.

Crashing through a row of buildings, the fallen hero laughed as he finally came to a stop on top of a dumpster, before hopping up and slowly walking back to where the others were.

"Oy, my head," Harley groaned as she stood up, blood tricking down the side of her face. "H-hey, what did you do to my Puddin', you little brat?"

The arm that he'd thrown the punch with now limp at his side, broken yet again, Midoriya ignored the jester woman as he watched in disbelief while Saitama confidentially strode towards him, completely unharmed.

"Midoriya, we need to get out of here! All Might is probably fine, but we need to let the pros handle this now!" the glasses-wearing boy yelled to his friend.

"No, no there's something off about this guy…" the teen answered as he clutched his busted arm. "I hit him with a full smash, and he didn't even react to it. His quirk must enhance both his power and his durability."

"Quirk this, quirk that, I have no idea what all that means," Saitama said with a flip of his hand. "C'mon, which hero do I have to kill for the cool villains of this world to notice me?"

"Dammit, get back!" the taller boy yelled as he stepped in front of his green-haired friend. "C'mon Midoriya, hop on my back. I'll run us back to U.A"

"Nah-uh, you brats need to learn your place!" Harley Quinn yelled as she appeared behind the kids and swung her hammer at them.

The taller teen with glasses kicked up one of his legs, which was revealed to have several metal protrusions coming out of his calves, and in a blur of motion, knocked the mallet out of the young woman's arms, sending the weapon thudding across the alley floor.

"Whoa! What's with your legs?" Saitama laughed upon witnessing Harley getting disarmed. "These kids are interesting, maybe I'll get the attention of this world's criminal underworld if I reduce them to little red splats on the pavement…"

The teenagers bore expressions of fear as the caped baldy stepped towards them, although their bodies again readied for battle. Had he been his old self, Saitama likely would have been impressed by the youth's resolve, although his current personality saw them as nothing but bugs that he could easily squash.

"D-dammit, kids, let's go!" All Might yelled as he suddenly slid in front of the bald clown, his red, blue, and yellow costume drenched in blood as his once-large body had been reduced to a frail, skeletal frame where only one of his arms retained its muscle mass from before. Grabbing both the teens, the hero's legs expanded for a second, where he jumped high into the air and sailed over to a larger building in the distance, leaving a pool of blood where he once stood.

"Yeesh, the big guy looked like he was on death's door," Harley whistled as she retrieved her mallet. "You gonna follow them or what?"

"No, I think I'll let that hero's appearance speak for itself," Saitama replied with a grin as he crossed his arms. "Well, we went fishing, let's see what we catch! HAHA lets reel us a big villain!"