As much as I like to be positive about idols and their talents, I really can't defend Yeri. Mostly because I think RV were great as a 4-member group, but also cause her voice is SO bad. Like. I quite literally can't listen to it, it grates on my nerves that much. She's the only idol I've ever disliked this much. And it doesn't help that she's exceptionally plain looking and kind of dead in the eyes.
Mine it would be Eunjung... (dont shade it Xalric)
She's actually the only one that you can hear in every T-Ara live performance, so I see where you're coming.
But for me I don't know. I really love Solji's power and control, but I love Minzy's voice, but then again I like Sojin's tone. And these days I'm all about Whee In.
I haven't mentioned male one since i am not that familiar with male groups but if i had to pick one it would be Jun K... i like his voice a lot... or MBLAQ G.O
Yeah I don't really (read: ever lol) use boy groups/music so I'm the same, but Jun. K was the first male voice I ever really loved when I listened to his solo last year. It's not the best voice ever but it's v. distinct and fun and hits me in the right spot so I love it.
Speaking of males, I'd throw BTS's Jimin in there too. The things he can do with his voice.
IKR
she has matured a lot in a good way.. i never cared for her but watching Producer i really liked her reactions and behavior... Also i cant but feel bad for what happened.. she would be on Korea's most succesfull Group and all fell apart in an instant...
Like with actual videos. How did I not hear about this!??? Good for them though. 
