Idk, I love seeing Hyuna in music videos but in live performances - naaahhh. She kinda reminds me of Brit. They both don't even hide anymore if they lipsynced and some times they half-assed the choreography.
CL stays as THE BEST female K-Pop performer (would never forget when I saw her live). No other comes close. Ailee is great too sometimes as a performer. And my bae Hyoyeon killed it on Hit The Stage, I feel like she had to hold back when she performed as a group. As for girl groups, I'd give it to 2NE1, SISTAR (all live stages for "I Like That" are amazing), BLACKPINK & Wonder Girls.
As for males, actually most of them are really good. For K-Hip-Hop/K-R&B artists, Bobby, Zico and DEAN are all amazing live. As for idols, Taeyang, BTS, BIGBANG, GD, IKON, GOT7 & NCT are all great performers as well.