Some non-NIG Members by Stage Name:

• BoA
• Uee (After School)
• Joy (Red Velvet)
• Yuju (GFRIEND)
• YooA (Oh My Girl)
• Saerom (fromis_9) 😢
• Yeseul, Jooa (Hi-L) 😢😢
• Yuju, Bora, May (Cherry Bullet) 😢😢😢
• J (STAYC)
• Sohee (Rocket Punch)
• Sohee (Wonder Girls)
• Bae (NMIXX)
• Choerry (ARTMS)
• Tzuyu (TWICE)
• Momo (TWICE)
• Yura (Girl's Day)
• JooE (Momoland)
• Yooara (Hello Venus)

Non-NIG Members with no N, I, or G in Given Name:

• BoA
• Saerom (fromis_9)
• Bora (Cherry Bullet)
• May (Cherry Bullet)
• Yeseul (Hi-L, LURA LUCY)
• Sohee (Rocket Punch)
• Sohee (Wonder Girls)
• Momo (TWICE)
• Tzuyu (TWICE)
• Yooara (Hello Venus)

Non-NIG Members with no N, I, or G in Family Name:

• Joy (Red Velvet)
• Bae (NMIXX)
• Tzuyu (TWICE)
• Yooara (Hello Venus)

Non-NIG Members with no N, I, or G in Both Family and Given Name:

• Tzuyu (TWICE)
• Yooara (Hello Venus)

I thought of Chou Tzu-yu almost immediately (though her Korean translit would be Jeou Jjeuwi)

Just add that to the pile of reasons to #keepkpopkorean