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Full Name: Kim Taeyeon
- The Leader: Unfortunate responsibility as the oldest.
- Multicolored Hair: Seems to have a thing for dyeing the tips of her hair.
- Had blonde tips in 2011, affectionately dubbed "Pepero hair". (Pepero: Korean pocky sticks).
- In "The Boys": brunette, pink and blonde.
- Had a fuschia strip through her hair in Twinkle era.
- Green tips on blonde in I Got A Boy
- Red ends in Galaxy Supernova PV.
- No Sense of Direction: Apparently, once her destination was directly across the street but she took a taxi. The taxi driver gave her a strange look... and made a U-turn. Ten seconds of driving, tops.
- Older Than She Looks: Looks like a 10 year old kid sometimes. As the saying goes, Kim Taeyeon is immortal.
- Pretty Butterflies: Her signature contains a butterfly.
- Refusal of the Call: Expressed her desire to step down from the leader position at some point, but Sooyoung talked her into staying on.
- Resigned to the Call: Most fans still regard her as the leader of the group, and she seems to have come to terms with this.
Full Name: Susan Soonkyu Lee
- Badass Adorable: Catches snakes and chickens with her bare hands.
- Cat Smile: Her face is made for◊ these.
- Friend to all Children: Best Mom, as seen in how she took take of a child in Invincible Youth.
- Kaleidoscope Hair: Has been brunette, blonde, red, pink, green, purple...
- Lady Drunk: Very good at drinking.
- Magical Nanny: As the best mom in Hello Baby and taking care of a child in Invincible Youth.
- Older Than She Looks: Often mistaken for the youngest member despite being the third eldest thanks to her overly cutesy actions and petite frame.
Full Name: Stephanie Young Hwang
- The Klutz: Made mistakes and fell a lot in their early days, so fans decided to call her DdilFany (Clumsy Fany).
- Missing Mom: Her mother died predebut.
- NO INDOOR VOICE: TIFFANY IS VERY LOUD.
- Hartman Hips: While she's not as "top heavy" as Sunny or as long and slender as Sooyoung she does have her "assets."
Full Name: Kim Hyoyeon
Full Name: Kwon Yuri
- Ambiguously Brown: By Korean standards. Is also known as "Black Pearl".Sooyoung: "The dark kid is Yuri."
- Bifauxnen: A◊ photoshoot◊ has her dressing boyishly and with short hair.
- Even the Girls Want Her: Both fan girls (and the girls themselves) have taken to calling her "Yuri-oppa" and "Manyul" after her solo performance of '1 2 step' and 'If' and ESPECIALLY after the photoshoot◊ mentioned in Bifauxnen.
Full Name: Choi Sooyoung
- Ambiguously Brown: Some have commented that she looks Filipino/South-east Asian due to her dark skin.
- Fangirl: A big one of Brad Pitt.
- Huge Schoolgirl: Is one in the flashback scenes of the drama, "The 3rd Hospital".
- Raised as the Opposite Gender: Was raised as a boy when she was a baby because her mother wanted one. This included wearing pants and having her hair short.
- Sesquipedalian Loquaciousness: Known for her way with complicated vocabulary. It shows during interviews.
Full Name: Im Yoona
- Accidental Pervert: Lifting Tiffany's skirt onstage and photos of her touching the others' butts much to her chagrin.Yoona to Jessica in Intimate Note: "Unnie, you always touch my butt but why is there a picture of me looking like a pervert touching yours!"
- The Face: Her official position in the group. However she does not speak much in interviews.
- Fangirl: Spazzed over Takuya Kimura quite a few times.
- Missing Mom: Has not seen her mom since young for unconfirmed reasons.
Full Name: Seo Juhyun
- Brainy Brunette: Often sports brown hair and is very smart.
- Closer to Earth: The most down to earth member.
- Innocent Prodigy: She was this during their early years due to her brains and innocence.
- Jack-of-All-Trades: Can sing, dance, cook, play sports, play piano and guitar, compose, speak Korean, Japanese, Chinese and English, was second in her class and is beautiful to boot.
- The Smart Guy: Is known to be smart with very good grades.
- Trade Mark Favorite Food: 'Goguma' (고구마) or sweet potatoes.
Full Name: Jessica SooYeon Jung
- Alliterative Name: Jessica Jung.
- Breast Attack: Jessica's boobs are titanium.
- Cannot Tell a Joke: The Sica Effect.
- Catchphrase: "Daedanada."
- Cool Big Sis: The older sister to f(x)'s Krystal who looks up to her.
- Defrosting Ice Queen: Once you get to know her, her Ice Princess facade melts.“I think rather than being over-friendly at first, having a cold first impression and slowly making them realize that I’m not that cold is better.” - Jessica.
- Delayed Reaction: She takes a while to process jokes.
- Family Business: Her younger sister, Krystal Jung, is part of the girl group f(x).
- Fangirl: Her and her sister's short-lived reality show Jessica & Krystal reveals that she's a fan of Pharrell Williams, Frank Sinatra, Coldplay, and Radiohead. She stated that she's a huge fan of bands who sing songs she can't sing herself.
- Ice Queen: Her nickname is "Ice Princess".
- One Note Chef: Can only make kimchi fried.
- The Peeping Tom: Has photos of the other girls changing (taken without their consent) on her phone in the dorm.
- Screaming Woman: Her trademark dolphin scream that is usually accompanied with violence.
- Terrible Artist: Self explanatory when you look at her painting of Sunny◊ and drawing of Tiffany.
- Unperson: If this post-Jessica-departure group performance of Into The New World is any indication, it seems like SM is making it like Jessica was never a part of the group at all.
- World's Most Beautiful Woman: World's 5th Most Beautiful Woman of 2012. Taeyeon and Yoona were also on the list.