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Izuku is a very timid, reserved, and polite boy, frequently overreacting to abnormal situations with exaggerated expressions.
Due to years of being looked down on by Katsuki for lacking a Quirk, he is initially portrayed as insecure, tearful, vulnerable, and non-expressive.
Izuku gradually matures into a more confident and brave person who's always eager to prove his worth as a hero, eventually developing
strong leadership skills,which combined with his passion and strategic abilities, have turned him into a central figure within Class 1-A alongside Katsuki.
Izuku is a quite diligent and strong-willed student, being extremely (and sometimes scarily) enthusiastic about topics related to heroes.
His dream drives him to write down notes about everything he learns in regards to heroes' Quirks and fighting capabilities.
Thanks to this practice, Izuku has developed a great analytical mind and can form complex battle plans in a few seconds,
factoring in the best ways to use his Quirk.
Izuku is known to help or lecture people with personal and emotional problems, regardless if it's his business or not,
claiming that a hero should meddle in other people's lives.
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Trained Muscles
Usage of One For All requires the user to have strong muscles, as One For All is a lot to handle and
could cause the user's body to be blown apart. Deku diligently trains his muscles every day and becomes physically stronger throughout the series.
He is often seen running laps and using dumbbells or grippers to train during his free time.
Deku can also be observed doing the air chair exercise during the breaks between classes.
Immense Stamina
Izuku has shown on many occasions that he is capable of handling large amounts of pain.Such times were mostly side-effects of overusing
his Quirk and frequently led to various broken bones.
Izuku is able to avoid those repercussions by staying in a safe range of One For All power output (currently, this is around 45%).
Should he be forced to output more power, Izuku is still capable of fighting decently even with broken limbs thanks to the effects of adrenaline, but will succumb to exhaustion a while later.
After multiple months of hard work and training with the No. 1 Pro Hero Endeavor, Izuku has become much sturdier and
resilient when it comes to the drawbacks of his Quirk, allowing him to withstand the recoil from 100% attacks without being instantly incapacitated.
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Immense speed
Izuku possesses great reflexes with and without Full Cowl. He can react in time to defend from Shoto's ice which has been shown to occur in the literal blink of an eye
and can keep up with Katsuki's movements in their first fight.
At 100% his speed rises to levels rivaling or even surpassing that of All Might, which allows him to casually blitz capable villains and move several times faster than the eye can see.
During his fight with Overhaul, he could completely out-speed the villain and move fast enough to create afterimages, and later completely overwhelm him with an instantaneous rush of punches.
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Leadership Skills
As a natural consequence of his bravery and strategic mindset, Izuku has displayed incredible leadership skills on various occasions.
By the start of his U.A. life, Izuku had already earned the trust of Ochaco Uraraka and Tenya thanks to his actions in the U.A. Entrance Exam,
which was enough to allow him to be voted class representative early on (having relinquished the position to Tenya shortly after).
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Adaptability
Thanks to his analytical abilities, Izuku is able to replicate the techniques of others. For example, after training with Gran Torino and
gaining minor mastery of One For All, Izuku was able to duplicate Katsuki's moves during a training exercise.
After training and drawing inspiration from his classmate, Tsuyu Asui, Izuku has become proficient enough with Blackwhip to
generate a dark tendril from his tongue, allowing him to replicate her "Froppy Style" combat.