En was a fairly short man with short, dark hair parted twice away from his narrow eyes.
His hero costume consists of a large jacket with numerous straps and buttons, and a high collar that obscures his mouth and nose. Accompanying this are dark, fairly-baggy pants and large white hiking boots. His forearms are also wrapped in sports tape.
En is a normally quiet individual, emphasized by his attire obscuring his mouth and the fact that on his behalf, his predecessor, Daigoro Banjo, introduced him to Izuku Midoriya. He is well-aware of the limitations of his Quirk, guiding Izuku on how to best use it in conjunction with his other Quirks. Given that he resisted having One For All stolen by All For One on two separate occasions, En presumably has an extremely strong willpower.
At some point in the past, En received One For All from his predecessor, the fifth user Daigoro Banjo, after he was injured and trapped under a pile of rubble. Daigoro extended his injured hand at him so En could acquire One For All after consuming Daigoro's blood.
Some time later, All For One attempted to steal One For All from En twice, but failed. At some point, as the sixth user, he met Nana Shimura. After ending up seriously wounded in a battle with All For One, En gave Nana some of his hair so that she could become the seventh heir of the One For All Quirk.
During the fight between Izuku and Hitoshi Shinso in the tournament of the U.A. Sports Festival, Izuku is brainwashed by Hitoshi's Quirk, who orders him to walk out of bounds. Although Izuku tries to resist, he cannot disobey the order, when he is about to cross the edge of the ring, En and the rest of the previous users appear to Izuku as shadowed mental figures. They uncloud his mind and allow Izuku to use One For All in his fingers, allowing him to escape the trance and win the fight.
For several months, none of the users reappear to Izuku again, until the night before the Joint Training Battle, where En and several of the previous users, including All For One's younger brother and Nana, appear in a dream but with his real appearance, and not as a shadowed figure. The dream shows Izuku memories of the first user.
En says nothing, but the first user speaks for everyone and assures Izuku that he is not alone. Izuku's dream concludes with all of his predecessors looking at him with kind expressions, seemingly aware that he is the ninth wielder of One For All and welcoming him.
In the aftermath of the Paranormal Liberation War, when Izuku is rendered comatose, he speaks to all the vestiges within One For All. While conversing, Daigoro mentions that he and En attempted to have One For All stolen twice by All For One, but succeeded both times in keeping One For All from the villain's hands.
During Izuku's fight with Muscular, he used En's Quirk for the first time, though ended up releasing more smoke than necessary. En spoke to him, agreeing and scolding him for spreading his control too thin. En explains the increased power of One For All and the Quirks stored within them while remarking on the limited applications of most of their Quirks, exclaiming that none of them can be raised to the ultimate move level. He notes that Izuku has far too much respect for these Quirks and encourages him to think of them all as tools in his arsenal to use to form a strategic plan.
Overall Abilities: The full extent of En's abilities are unknown, but as a One For All vestige he can be assumed to be quite strong. However, he wasn't strong enough to defeat All For One.
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 if they don't possess the necessary strength of the body.
One For All (ワン・フォー・オール Wan Fō Ōru?): Transferred to him from Daigoro, En's second Quirk allowed him to stockpile an enormous amount of raw power, allowing him to significantly enhance all of his physical abilities to a superhuman level. This resulted in unbelievable levels of strength, speed, agility, and durability.
- The kanji in his name means "smoke" (煙 en?), a reference to his Quirk.
- En is so far the only user whose name does not possess a kanji in conjunction to what number user they are.
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