Sasuke could do it after 3 years training with orochimaru (not exactly 3). He had way more experience than sasuke so of course he could do it too. In terms of basic eye usage, he only knew of one person who surpasses him and that was madara, little Sasuke isn't there yet and even if he got there, he wouldn't be standing still waiting for him to surpass him like itachi, he would get stronger too, granted Itachi had his condition.
"And you brought someone with you," kurama growled. ( y'all know his voice.)
"Those eyes!!!!! The sharingan, I've never seen that form before ...… and this chakra, a bone chilling abyss of despair that inspires fear, but how is it possible I feel no emotions from it...… What exactly are you?!! " Kurama questioned.
"Who me? I'm just an.... Intruder" Mugen smiled.
".... " kurama
"What exactly is going on, hey? " kushina bounced back from her confusion. Swook. Mugen glared at her, she froze.
Mugen looked at kurama and they had a short staredown. "Puchi" Mugen suddenly laughed.
"What's so funny? " kurama growled menacingly.
"Oh I was just thinking of the cute giant baby fox you used to be and looking at the current you. " mugen said.
"You!! " kurama widened his eyes threateningly.
Not giving him a chance to continue, "Like I said before I'm an intruder, I happened to witness that scene from so long ago, when the sage split the ten tails into you nine. Call it a vision or the like. You were so cute back then and the others as well" Mugen bullshited.
"Not feeling six tails though, I'm sorry, I just can't. " he added in his mind.
"Times have been rough, I guess you've seen the 'ugliness ' of humanity. That must be why you have so much hate within you. " Mugen donned a nostalgic look.
"..... "
"Humans have never been perfect, they are far from it. The sage wanted you nine to serve a purpose have you forgotten that, kurama" Mugen looked into his eyes.
"Grrr, What do you know!!!!!!!!!! You know nothing!! " kurama bellowed.
"Hating it won't help kurama, accept it. " Mugen said calmly, unaffected by his menacing evil aura.
"You know I plan to bring peace to the ninja world, I'm not for that take it slowly and peacefully business, I'll do it my way, and my way shall be the only way, I will dominate the shinobi world, and unite them as one, understanding each other comes later. "
"I'll set you all free, but I'll have you fulfil hagoromo's wish, I won't live forever... Wellll I could if I wanted but that would be boring, I doubt the ones close to me could do the same, being immortal with no one to share it with would be pointless, granted I will live a hundred years at the very least. You nine have existed since long ago, I think you have a lot more life left, after I unify the shinobi world and die, I'll leave it to you and the next generation to protect that peace. "
"Honestly fighting makes me feel alive and I'm not a peaceful person however war cannot exist forever, shinobi would die out and face extinction, ninshu was meant for people to better understand each other and stop the fighting, it just added oil to the flames however, it's better late than never. "
Swoosh
Mugen somehow breached the seal and appeared on kurama's face. He looked into his gigantic eyes and then he suddenly pinched his cheek. "You still have some of your baby face left little kur kur. "
"Roaarrrrrr!!!!!! Get off me I'm going to kill you!!!!!! " He swiped at mugen with his claws. Mugen somersaulted in the air and dodged.
"Hahaha, you're so cranky kur kur, like an old man" Mugen laughed.
"Why you!!!!! " kurama lunged at him. He disappeared and reappeared outside the seal. Swoosh. He lifted up his hand and pointed up.
"I'll shatter that hate you possess and bring peace to the ninja world, I'll be counting on you. When the time comes let's have a drink to celebrate. We still have a few years to go, till then sit tight, you've waited all this time haven't you. " He walked off leaving a kurama trembling in irritation wishing he could rip him apart.
"Ah I almost forgot" Mugen turned to look at him.
" I am Mugen uchiha it was nice meeting you kurama. " He smiled.
----------------------------
Only an instant had gone by in the real world. Mugen had glanced at her and walked off. (Not like genjutsu battle). She was alone, she had probably slipped out to get some fresh hair, she was quite the unruly one after all. She had no escorts so it wasn't a problem though even if they were there Mugen was so slick they wouldn't have noticed.
Kushina snapped back to reality, "What just happened? " she searched her memories and could vaguely remember two bone chilling eyes... "What was that? "
Suddenly she saw her favorite food being sold in a stall near to her, *girly shriek* she raced over and ordered one forgetting all about what she was just doing.
Elsewhere Mugen was walking through the streets and looked up habitually. The sun as setting. There was a beautiful purple hue to the azure sky.
He started walking again.
"Even though my chakra is kage level and so are my skills, I am still inexperienced, some cases like A's speed and kamui can't be handled ordinarily even if you know it's weakness. Nothing was absolute. "
He had no equivalent to the rasengan or chidori nor the bijuu mode and susanoo . Hashirama had his Dragon and .... That ….thing that he didn't remember it's name. While he had some versatile skills in a head on fight he would be at an disadvantage in attacking with jutsu. He had to make a two or three S rank or above justu as he had none. His clones were spreading his chakra thin but he would just have to make due.
--------------------------------
In a small town at a certain inn.
One of Mugen's clones crossed paths with a bunch of men cursing, "That damn big titted sucker, how dare she borrow money and not pay us back after so long, we finally found her but she gave us the slip, damn that bitch"
A blonde haired little girl was in the corner eating a popsicle. The group of Bill collectors crossed paths with her.
"Misters you shouldn't curse. " She said sweetly.
"Yea yea kid, have you seen this blonde chick with huge jugs. " one of them motioned with his hands.
"Ah yea, she ran by here a moment ago she seemed to be in a real rush" she said smiling.
"What?!! For real, which way did she go? " they asked in unison.
"That way" she pointed.
"Thanks little girl, damn we'll definitely catch that bitch!! " they rushed out.
Mugen (clone) watched the events unfold with his eyebrows twitching.