<3 - Definite answer; if you know any good fics starring them, feel free to post the link below :)
? - I've heard/seen them, but I don't really have a bias/don't listen to them often/don't know them that well
--- - never watched them perform

100%: ---

2AM: ?

2NE1: CL

2PM: Taecyeon

4minute: ?

AOA: ---

After School: Nana

APink: ?

Bangtan Boys: V

B.A.P: Himchan

B1A4: Jiyoung

Beast: Dongwoon

Big Bang: GD

Block B: ?

Boyfriend: Minwoo

Brown Eyed Girls: Jea

BTOB: ?

C-Clown: ---

CNBlue: Minhyuk

Crayon Pop: ?

Dalmatian: ---

Dal Shabet: ---

DBSK: Changmin

EXO K: D.O

EXO M: Lay

f(x): Krystal

F.Cuz: ---

FIESTAR: ---

FT Island: ---

Girl's Day: Minah

Girls' Generation: Tiffany

Glam: ---

Hello Venus: ---

History: ---

Infinite: L & Sungjong

JJ Project: JR?

JYJ: Jaejoong

Kara: Seungyeon & Gyuri

LC9: ---

MBLAQ: Thunder & Mir

Miss A: Min

MYNAME: ---

Nine Muses: ---

NU'EST: JR

Secret: Jieun

SHINee: Jonghyun & Minho <3

Shinhwa: ---

Sistar: Hyorin

SS501: Hyungjoong

Sunny Hill: ---

Super Junior: Donghae

T-ara: Jiyeon

Teen Top: L.joe <3

Topp Dogg: ---

U-Kiss: Eli & Soohyun

VIXX: N & Hyuk

Wonder Girls: ---

ZE:A: ?