Which Naruto characters would replace the MHA characters more accurately in MHA AU?
Naruto Uzumaki ➡ Mirio Togata
Naruto is a lot of things but nervous and shy isn't one of them. Izuku may be the protagonist of MHA but Naruto is like Izuku only in terms of his desire to protect everything that breathes, oblivious towards the blatant interest of opposite sex and their determination to succeed.
Mirio, on the other hand, is optimistic and shares same sentiment towards helping others. He, like Naruto, is not the brightest student and can be dumb and goofy. He is also a jokester of sorts and makes fool of himself like Naruto. Both of them are very hardworking and train themselves to master hardest techniques.
Naruto's quirk: Pressure control
Sakura Haruno ➡ Kyoka Jirou, Ochako Uraraka
Jirou is cool, smart, level-headed and quite aggressive. Sakura is book smart, is dry when she wants to be, isn't afraid to put people in their places when they show disobedience or act silly, and has leadership qualities. Both are self-conscious of their looks and bodies and have aversion to horror settings.
Ochako and Sakura are both strong willed, both work hard to be useful to their friends and don't want to left behind. Both are competitive, friendly and kind. Both become shy in front of their love interest. Ochako wants to become a good hero to support her parents and help people, Sakura worked to truly become a shinobi to stand beside her teammates. Ochako cares deeply for Deku, regardless of her feelings for him, like Sakura towards Naruto.
Sakura's quirk: Super strength
Sasuke Uchiha ➡ Shouto Todoroki, Katsuki Bakugou
Both Shouto and Sasuke are cool, quiet, impassive and blunt. They are top students of their class and are popular for their pretty-boy looks and their powers. They both are from influential families and have a strained relationship with their father and older brother who is a villain. They both are intelligent and top of their classes.
Katsuki and Sasuke are arrogant, tend to look down on others and desire to be on the top. They tend to snap at their rivals and often lose their cool in their presence. Both secretly cherish and care for their friends, but are really bad ar outwardly expressing them. They are antisocial and prefer to train over socialising.
Sasuke's quirk: Electricity
Shikamaru Nara ➡ Shinsou Hitoshi
Both are straightforward and clever enough to be one step ahead of the rest. Both are antisocial yet have many friends who are absolute sunshiand are manipulative when they want to be. Both have their mentor's quirks passed onto them – smoking and love for cats.
Shikamaru's quirk: Shadow control
Rock Lee ➡ Eijirou Kirishima
Both are overly enthusiastic about manly things and youth, have optimistic personalities and are insensitive to what people says about them. They care and believe in their friend – Neji/Bakugo – no matter how they shun him away.
Hinata Hyuga ➡ Tamaki Amajiki, Eri
Both are extremely shy in social settings, show outward signs of social anxiety when it gets best of them, doesn't believe in their strengths and look up to Naruto/Mirio.
Eri and Hinata, both are timid and naive. Like Eri, Hinata is accepting of her father's opinion of her and doesn't stand up for herself. While not psychologically traumatised like Eri, Hinata has her social.
Hinata's quirk: X-Ray vision
Shino Aburame ➡ Fumikage Tokoyami
Both are odd ones in their groups, blunt to a fault and have distinctive way of speaking. They are both underestimated and are powerful in their own rights. Tokoyami has his bird and Shino has his bugs to assist him.
Shino's quirk: Insect control
Neji Hyuga ➡ Seiji Shishikura
Both are proud, dignified individuals and are strong believers of their opinions about who can/cannot become heroes/shinobis. Both are arrogant about their abilities and tend to be very cruel to others at times, but that's where their similarities end.
Neji's quirk: Deflection shield
Both are not afraid to speak their minds and are very stoic individuals who rarely show emotions. While both are blunt and to the point, they also are compassionate and care for their friends deeply. They are also very supportive and reliable individuals which makes them great partners.
Konan's quirk: Telekinesis
Nagato Uzumaki ➡ Tomura Shigaraki
They both have been manipulated by Sensei/Madara. They both wanted to ruin Shinobi villages/Heros of the world for what they were manipulated into believing a greater cause. They both hide their true identity from the rest of their allies, behind hands and reanimated body. Both, as a child, were kind, compassionate and desired to help others.
Nagato's quirk: Resurrection
Itachi Uchiha ➡ Dabi/Touya Todoroki
Personality-wise, both are similar in some ways – aloof, confident, smart, stoic and cautious. Both often taunt their brothers by pulling on their abilities and weaknesses, however, their intentions couldn't be more different. If Itachi had been a true villain with no martyr tendencies, only rightly placed anger, then he could be considered as true Dabi of Naruto universe.
Itachi's quirk: Hallucinations
Kakashi Hatake ➡ Eraserhead/Shota Aizawa
Both find their wards troublesome and causes trouble to them as much as they could, but they both secretly love them to death. Both have protective steaks in them and always turn 180 on their enemies who dare to pose threat to their kids. Both have distinctive – Aizawa usuallu has his sleeping bag with him and Kakashi always have his porn with him.
Hashirama Senju➡ All Might/Yagi Toshinori
Both are revered as idols and are considered the strongest heroes. Hashirama established the idea of 'will of fire' and All Might is considered the 'symbol of peace', which is an idea of goodwill. Both are jubilant individuals, brimming with positivity and strength. They are always shown smiling and have inspiring personalities that are well-liked by others. Hashirama, like Yagi, have serious streak in him which is in contrast to his normal, cheerful attitude.
Hashirama's quirk: Earth control
Anko Mitarashi ➡ Midnight/Nemuri Kayama
Both have similar appearances – purple hair, spiky hair and curvaceous figure – and dress provocatively. They both are quite sadistic and enjoy unsettling others like its their personal hobby. Both are impulsive, stubborn, playful, but also intelligent and resourceful individuals.
Madara Uchiha ➡ All for one/Sensei
Need I say? The boss villains whose powers rival the likes of Hashirama and All Might. Madara is better person than Sensei of course, but both are terrifying, manipulative, have animosity against Hashirama/All Might and can be considered the Symbol of Evil. Both are power-hungry, ruthless and manipulative. Despite their merciless nature, they also seem to love their younger brother.
Madara's quirk: Gravity control
Tsunade Senju ➡ Healing girl/Chiyo Shuzenji
Both are old women. Like Chiyo, Tsunade is kind and compassionate, but also harsh and chiding towards crazy and reckless people. They are both expert doctors.
I had so much fun comparing the characters of my two favourite fandoms for this post. As far as abilities goes, I am happy with this list. I think Fire Control is the most overused ability ever. Gravity manipulation is my favourite ability; if you can increase and decrease the gravity then you are nearly the strongest person. Madara is that. It's insane how strong he is in Naruto, I didn't give him all that credit here.