Cute Bruiser: She seems to like to punch the people who are the target of her anger, and unlike her male counterpart, is said to display great physical strength when she becomes emotional.
Fan Nickname: She's often given the name "Felicia" by the Western fandom as her human name, whereas the Japanese fandom seems to prefer "Alice" (pronounced as "Ah-LEE-che") judging by how quickly the Pixiv tag for the name filled up after Himaruya mentioned that someone suggested the name to him for female Italy.
Fan Nickname: Both Western and Japan fandom commonly call her "Louise" or "Luise" as her human name. Some fans also opt to use "Monica", an unofficial name suggested to Himaruya for female Germany, instead.
Scars Are Forever: Having notable ones on the cheek and midriff of her P2 version.
Tomboy: She's certainly got the looks of one and is portrayed as an Action Girl in Fanon.
Japan
Let’s just calmly go somewhere safe without aiming the bat at anybody.
A-Cup Angst / Pettanko: She appears to be rather flat-chested compared to many other nations on this page, and many fanworks have her being self-conscious about her lack of assets compared to other female nations'.
Fan Nickname: "Sakura" is the most widely accepted fanon name for her in Japanese fandom, and it was in fact suggested to the artist. Many Western fans, however, continue to use "Kiku", the human first name the artist gave to her male counterpart, for her because Kiku can also be a female name.
Fan Nickname: Fans from the Western fandom have often given her the name "Amelia", "Amanda", "Abigail" (shortened to "Abby") or "Allison" (shortened to "Ally"). However, the Japanese fandom seems to prefer the name "Emily" for her.
In-Series Nickname: In the strip where the genderbends appear, she is called (what is translated to) Americako. Most of the fandom, however, simply call her "Ameriko".
Fan Nickname: Both Western and Japanese fandom have given her the name "Alice". And though unofficial, Himaruya had mentioned in his blog that someone had suggested the name "Rosa" for England. Western fans may also call her "Rose", "Ann", "Elizabeth", "Rosemary" or "Audrey". Some people prefer to call her "Guinevere", referring to King Arthur's wife.
Fan Nickname: She has been given the unofficial name, "Françoise", by both sides of the fandom. Though, there are some fans who alternatively choose "Marianne" as her name instead.
The Ojou: Looks much classier than her male counterpart, and is also said to be a snob.
Fan Nickname: "Anya" is commonly chosen as her human name by fans, and was even suggested to the artist at some point. "Ivanna" is also popular among fans as well as "Anastasia", "Inna" and "Irina".
Hair Decorations: Maple leaf-shaped ones, according to the latest sketches.
Fan Nickname: Western fandom seems to prefer "Madeleine" (shortened to "Maddie") as her name. Also, Himaruya had said on his blog that a fan had suggested her name be "Marguerite" with her nickname being "Meg" for short; this name is unofficial.
Meganekko: This added with the pigtails makes her more resemble England than America.
Non-Human Sidekick: Like her male counterpart, female Canada has a bear named "Kumarie" who, according to Word Of God, is much more "violent and scarier" than Kumajirou.
Boobs of Steel: Subverted. Romana has been said to be a better fighter than her male counterpart, but a group sketch shows she certainly doesn't have big breasts. Fanon on the other hand loves to play this trope straight.
Fan Nickname: She is often given the name "Lovina" by most of the Western fandom. Japanese fandom, however, calls her "Katarina" or "Catalina". According to Himaruya, a fan had once suggested for her name to be "Chiara". The name, though, is unofficial.
Idiot Hair: She was originally designed without a haircurl, but it was later added back in a 'chibi' sketch.
Spell My Name with an S: As "Katarina" is hardly used by Italians, fans sometimes opt to call her, "Caterina", a more commonly used name in Italy.
Tsundere: She's been portrayed to be Type A like her male counterpart, but not as fierce in fanon.
Fan Nickname: She is either called "Isabel" or "Carmen" by Japanese fandom. Western fans on the other hand often prefer to call her "Antonia", "Maria" or "Rita".
Like A Daughter To Me: A note about her on Himaruya's blog states that she views Romana as her own daughter.
Spell My Name with an S: The same with her male counterpart, there is still much debate if her surname should be "Fernandez Carriedo" or "Hernandez Carriedo".
Fan Nickname: Japanese fandom has given Hungary's male counterpart the names "Daniel", "Hendrik" or "Elian". Western fans usually just shorten his country name to "Gary"; "Mangary" is in fact a common term used for him.
Tall, Dark and Bishoujo: Subverted. Certainly dark, but she's one of the shortest and only seems the tallest because she's jumping so high. Also, Genki.
Fan Nickname: Some fans call him "Aleksandr" or the diminutive "Sasha". Others refer to him as "Nikolai"/"Nikolas", or its diminutives "Niki"/"Nikita".
Yandere: Pixiv fanart picked up on this a bit even before the first day he was revealed finished. One can also assume he's yandere for fem!Russia, but YMMV.
Ukraine
Fan Nickname: Fans often prefer the human name "Yuri" for Ukraine. "Demitri"/"Dymtro" has also been seen.
Cool Big Sis: "A wild and strong-personality type older sister" according to the author notes.
Fan Nickname: Her most popular "human names" among fans are "Giselle", "Gisela" or "Maria". "Gretel" also isn't unheard of.
Himaruya had mentioned once that a fan suggested for "Julchen" to be her human name. However, as "Julchen" is an affectionate nickname, fans tend to opt for "Julia" instead.