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Izuku lunged at the AFo, not noticing as his appearance begun to change to his past self, he hair lightened to white with a grey streak, and one of his eyes turned red.
Tomura-" All For One stopped in the middle of an attack
"I told you that you weren't allowed to call me that!" He knew it was him since the Handyman wasn't here, "wait," he had just realized the super villain stopped seeming stunned, "why did you stop?"
The villain summoned a mirror, and floated it over, "just.. look."
Izuku, no Tomura, looked in the mirror and saw his hair and eyes were back to how they were in his last life,, h-huh? Is this a quirk I have, to look like my past self? But why is it just now activated?" He knew this wasn't any of the past users' powers, but he was sure he'd been quirkless, in both lives, hell, in this life he had an extra joint in his pinky toe.
"Why did you-" Yoichi must have decided to come out and show himself out of the quirk, "Tomu-?"
"I guess, I wasn't quirkless before I got OFA, heh.."
"I-I..." All For One didn't seem to know what to say.
You what?" Tomura asked, tone not at all cordia.
"I- the day you died.... something in me broke and I-I just all I wanted to do was..." Wait was he actually..."protect Yoi, I wanted to... but I only realized now I was doing it the wrong way- it took to long, and I don't expect forgiveness from either of you... I also can't really stop what I've been doing... it's become.. part of me... It, I'm sorry.."
Tomuea didn't know what to say, he's not sure whether to trust him or not and he can tell Yoicchan feels the same way.. "I... I don't know what to say, weather to trust you..." he really doesn't and he's ready l, if this is a trick, for an attack at any moment.
"Oh and there's something else I have to telli you..."
"Huh...?"
"Izuku Midotiya is my son..."
"I- WHAT?! But, my father, his name was..."
"Hisashi, no I used a fake name."
"Oh, fucking hell, you bastard, you left us! For your villain shit?! You bastard! I already hated you especially for naming your lackey after me, but this! Why did it have to be me?! Why couldn't it have been some random kid!?"
"You think this isn't weird for me to, finding out my son is my brother?" All for One said, looking at him, "and, I left to keep you and Inko safe, I didn't want you to get hurt."
"Like hell I'd believe that!"
"I only do so now because you have been given One For All, also my 'Lackey' as you called him earlier doesn't know of you as my son, nor my brother."
"What was his real name again? I know you said it during the Kamino Ward battle, but I've forgotten it,"
"Ah, yes, it was Tenko Shimura, grandson of Nana."
"And you renamed him so no one would recognize him right?"
"Yes, why?"
"Why name him after me?"
"If I said I was still thinking of you after nearly 200 years, would you believe me?"
"No, also, I'm sure you would have been as bad a father as ours if you'd stayed!"
"Low burn, but I agree." Yoichi said
"Damn, you really hate me that much?"
"Yup," the 'twins' said in sync
"I don't have very much faith that there's any of the old you left," Tomura told All For One, "I don't trust anything you say, well, not fully."
"I understand..." All For One said
And then the battle went on, the good guys won, but no one went all out, Tomura didn't since he noticed that All For One didn't and All For One didn't because he didn't want to hurt his son/brother more then was necessary