My biases!
Boygroups:
Junkyu-Treasure (top ult once he debuts)
Youngk-Day6 (current top ult)
Minho (ult) and Felix-Stray Kids
San (ult), Seonghwa, and Yunho-Ateez
Yuta (ult)-NCT (overall)
Donghyun (considering ulting)-Ab6ix
Woosung and Jaehyeong-The Rose
Rowoon and Hwiyoung-SF9
Dongpyo and Yohan- X1 (I miss them)
Rocky-Astro
Baron-VAV
Seunghun-CIX
Girlgroups:
Joy (ult)-Red velvet
Soojin (ult)- G-Idle
Chuu-LOONA
Momo-TWICE
Ryujin-ITZY