Itsuka is a young girl with large teal eyes and orange hair tied into a ponytail that hangs from the side of her head.
In her Hero Costume, Itsuka wears a light blue qipao, a black corset that ends just below her breasts, and short black spats. She also wears a brown utility belt and a black domino mask. For her winter hero costume, she switches out her normal qipao for one with large sleeves.
Itsuka is a spirited girl who is also thoughtful of others. She does not hesitate to criticize even her classmates if she feels what they are doing is not right, like whenever she stops Neito Monoma from antagonizing Class 1-A and the rest of Class 1-B. She is also willing to pass on opportunities that would benefit her if she feels other people deserve it better, shown when she let Tetsutetsu Tetsutetsu and Ibara Shiozaki participate in the tournament event of the U.A. Sports Festival in place of her team.
Itsuka seems to also be friendly to people outside her class and seems to hold no signs of ill-will towards Class 1-A, making her a minority of the 1-B students. She has displayed sympathy towards others, even if she is not particularly close to them. She showed concern for Izuku Midoriya and Tenya Iida after hearing about their run-in with Stain and helped Class 1-A by telling them what was supposed to be on the First Term Final Exam's practical portion.
When in combat, Itsuka is calculating and shows that she is very intelligent. She is able to understand Mustard's Quirk, reckoning it to that of a tornado, and using that logic to determine the user's location. She is also able to use her own Quirk to dispel the gas Mustard makes, allowing her and Tetsutetsu to fight without the need for gas masks.
Hand-to-Hand Combat: Itsuka seems to be quite capable at hand-to-hand combat, as she could incapacitate Neito with a karate chop.
Enhanced Strength: Itsuka appears to have strength greater than the average human since she can carry people and lift her enlarged hands without a problem, as seen in her fight against Mustard. Her enlarged hands grant her proportionally increased chopping and gripping strength. During the Joint Training Exercise, she proved to be strong enough to easily crush Momo Yaoyorozu's tungsten shields.
Intellect: Itsuka is shown to be rather intelligent, demonstrated when she theorized the location of Mustard and the pattern of his Quirk. She is also tactical, being able to figure out how to dispel of Mustard's gas.
- Double Jumbo Fist (双大拳 Sōtaiken?): With both her hands at normal size, Kendo strikes her enemy with them, activating her Quirk just before impact to maximize damage.
Battles & Events
- Joint Training Exercise
- Class 1-A vs. Class 1-B: Round 2
- In the First Popularity Poll, Itsuka ranked 13th, which currently makes her the most popular character in Class 1-B.
- Itsuka's surname contains the kanji for "one" (一?) and "excellent" (佳?), while her given name contains the kanji for "fist" (拳?) and "wisteria" (藤?).
- Her surname is a possible reference to her Quirk and the martial art.
- Itsuka likes black coffee and motorcycles.
- According to the author, Itsuka is very popular among his staff.
- In the anime, Itsuka came in 5th place for the U.A. Entrance Exam with a score of 25 Villain Points and 40 Rescue Points.
- Itsuka shares the same physical appearance, especially the one-sided ponytail, with Athena Cykes from Ace Attorney.
- (To Mustard) "Carrying a gun around is just another way of saying you've got no confidence in a fight. Because at least us simple minds at U.A... have grown beyond the point of ever thinking that there's no hope!"
- (To Momo Yaoyorozu) "Ever since we appeared in those commercials during our workplace experience, we've kinda been treated like a pair, you know? They always box us together like an idol group or something. But you have better grades and a better quirk than me, so whenever people would lump us together like that, I really couldn't stand it. I wouldn't show it though. So on a personal level, I always wanted to try duking it out with you!"