Ranma smiled to himself as he hopped rooftops, following Midoriya home. He'd already talked this over with Aizawa, who'd agreed to his plan. If Bakugo was fully intent on putting Izuku through hell to toughen him up enough to handle the world, then Ranma was going to start his training immediately. It was easy enough to follow as Midoriya walked with the gravity girl and the rocket leg boy - Ochako and Iida, if he was TA he should really learn the other students' names - and when they boarded the train, Ranma simply rode on top of it. At one point, someone in authority started to say something about his behavior, but Ranma had just flashed the UA Teaching Credential Aizawa had given him when they'd discussed it, and he'd been waved on ahead.

Once he saw Midoriya get off at his own stop, Ranma leapt off the train and began following, waiting until Izuku was on his own without anyone in the area to see what would happen. That's when he acted. "Dodge!"

As Ranma came down in a diving kick, Midoriya dove out of the way in reaction to the shout. As he rolled to his feet, his body was already energizing with his Quirk, though it started to fade once he saw who it was. "Ranma? What was that-"

"Why are you letting down your guard?" Ranma demanded as he charged forward and started throwing punch and kick combinations. To his credit, Midoriya reacted quickly, his Quirk already energizing his body to evade what blows he could and block those he couldn't.

"What is this about?" Midoriya demanded as he continued to evade.

"You think I was only going to dedicate four minutes to toughening you up?" Ranma countered as he went for a footsweep, pleased to see Midoriya leap over it and back to get some distance. "Looks like you've got maybe 2% of your Quirk flowing through you right now. That's boosting you two, maybe three times normal as well as letting you interact with energy based attacks physically. But that's not going to be enough to survive class, let alone tests and the like. And if you think you can handle the rest of the world on that, you've got another thing coming!"

"Oh, so this is training!" Midoriya responded energetically as he moved back into combat range. "Why didn't you say so?" He leaned back out of the way of another of Ranma's blows.

"Because a villain isn't going to warn you when he's going to attack," Ranma explained easily as he lowered his voice, now going to conversational as Midoriya finally started striking back. "And if they do, you need to be really worried, because they're either insane or really powerful. Also, don't swing so wide, you leave yourself wide open and you aren't being strengthened enough defensively to rely on that to protect you." To demonstrate, he swung his next blow inside Midoriya's punch, slamming his fist into the green haired boy's chin.

Midoriya staggered back, rubbing his chin as he felt the blow. "I see what you mean. Could have lost a tooth there."

"And you would have if I hadn't pulled that punch so much," Ranma added. He lunged in to fight again.

Midoriya held off on attacking for a time, staying defensive and watching Ranma's attacks. When he next started fighting back, he performed a respectable imitation of Ranma's combat style, though only with his arms.

"Not bad, but your Quirk is full body." To demonstrate, Ranma lashed out and caught Izuku on the inner thigh with the point of his foot, breaking his stance before delivering a roundhouse kick to his hip to knock him down. "So use your whole body."

"R-right," Izuku stammered before leaping back to his feet, idly rubbing the now forming bruises. "I take it those blows were pulled as well?"

"Quite a bit," Ranma confirmed. "Until you're able to channel..." He looked closely at Midoriya. "...I'd say, 25% of your power consistently, you can't rely on tanking blows, and your focus has to be on dodging. Even when you have that much strength, you should really dodge unless you're acting as a shield. For that matter, you're kinda puny to act as a shield as you are."

"Right, speed and evasion," Midoriya agreed, pulling out a notebook and jotting a few things down.

Ranma tilted his head as he read the cover on the notebook. "Pro-Hero notes, huh?" he asked curiously. "Volume 13? Been taking notes for a while, huh?"

"Y-yeah!" Midoriya agreed happily. "I've always tried to learn all I could about Pro-Heroes. Back when I was Quirkless, I thought it might give me a way to become a Pro-Hero even without a Quirk." He then tensed, as though he said something he shouldn't.

Ranma raised an eyebrow. "I feel like there's something there I should know, but that you shouldn't tell me," Ranma observed mildly. "So unless and until it becomes important, I'll stick with the explanation I gave Bakugo about your Quirk."

"Oh?" Midoriya asked hopefully. "What's that?"

"That your Quirk was missed, and was based in storing energy," Ranma explained quickly. "And because you were convinced you were Quirkless, a mental block prevented you from releasing the energy, leaving it building up to levels beyond what you could safely use until it got released fighting that slime thing, and that All Might probably trained you so you didn't explode every time you tried to use it."

"Uh, yes, yes! That's exactly right!" Midoriya gasped out, his eyes wide, sweat covering his face, and an unnatural grin on his face adding to the impression of his unusually high pitched voice. "It's amazing that you figured that out! You're really smart!"

"And you're a terrible liar, so I suggest you practice the explanation in the mirror until you don't get like this giving it," Ranma countered sardonically.

Midoriya hung his head in shame. "Yeah..."

"I will be talking to All Might about his approach, though," Ranma pointed out thoughtfully. "I mean, he's supposed to be a teacher, but his idea of strengthening you for a Quirk like this involves zero combat training before sending you to a school where your combat abilities are going to be the most important thing you're tested on? What was he thinking? He didn't even teach you how to properly throw a punch!"

"...huh, that's right..." Midoriya mused thoughtfully. "Then again, there wasn't exactly much time-"

"And given the nature of All Might's Quirk, I wouldn't be surprised if he's never had proper combat training, either," Ranma mused thoughtfully. "Something he really should have corrected before he accepted a teaching position." He paused as he heard a spurt of some sort of liquid behind him and saw Midoriya tensing up. "He's right behind me and just did a spit-take, didn't he?"

"O-of course not!" Midoriya stammered as he once more demonstrated how terrible he was at lying. "I mean, he really stands out so you'd notice if he was there, right?"

"His 'secret identity' form looks completely different and that's what's some distance behind me having watched the whole fight?" Ranma clarified with a smirk.

"Why am I so terrible at lying?" Midoriya gasped out in despair.

"That's nothing to be ashamed of, young Midoriya!" someone called some distance behind Ranma.

"Hey!" Ranma shouted over his shoulder. "My class right now! No back seat teaching!"

"Sorry," the voice called back somewhat muted.

"Hey!" Midoriya complained. "You can't talk to All Might like that!"

"Then stop me!" Ranma snapped back cockily. Turning around, he located the source of bio-energy - hidden around the corner - and called out, "Your father was a hamster, and your mother smelt of elderberries!"

"I love that movie!" the voice called back.

"Then Midoriya should stop stalling, or I shall taunt you a second time!" Ranma called back, only for his eyes to widen as he felt a build-up behind him. Unable to dodge in time, he triggered the Splitting Cat Hairs technique, letting him leave a ki-animated image of himself behind to take the rather impressive blow, sending the image flying down the street to disperse against a lamppost. He then stepped up to examine Midoriya's arm. "Hmm...5% in the blow, and no internal damage. Not bad." He then turned to the voice. "We should do this again sometime, it motivates Midoriya!"

"Next time I'll bring swords so we can do it properly!" the voice called back.

"Uhh..." Midoriya began in confusion.

"He's fun," Ranma observed as the source of the voice left. "I see why you look up to him so much. He's a good example."

"I don't know what's going on anymore..." Midoriya complained.

"You just learned a new aspect of your idol as a human being, that's all," Ranma explained. "And he's apparently a total dork. Given how bombastic he is in the field, that makes perfect sense."

Midoriya stared at Ranma for a time. "That's...oddly comforting."

"Good to hear!" Ranma replied, smacking Midoriya on the back and making him stagger. "Your homework is to maintain 1-2% of your Quirk energy through your body for as long as you can without strain. Your next assignment will come when you can maintain it while you sleep, and you can expect me to randomly engage you in combat throughout that time."

"...joy..." Midoriya whimpered.