Are you planning to make videos? 
You asked for my opinion on my wall so here it is:
- I would put Seulgi as the leader
- If you really must take two main vocals from Twice, Nayeon should be taken instead of Jeongyeon
- I would invert Rosé and Jisoo in the subunits, Rosé for elegant and Jisoo for the joyful. I would bring Wendy to the joyful as well
-Mina, Wendy(?) and Tzuyu would not be sub-rappers.. I get that you put them as that for the unit, but for an Elegant concept I think only one rapper is enough
- There might be a bit too many members in the Fierce unit. I think the selected members don't blend well either. I would suggest to think of a fourth concept/unit
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Yup! and thanks! These are my sub units
I revamped it
Sub-Unit 01: BLAZED
Concept: Hip-Hop, Girl Crush
Members:
Seulgi Lead Dancer, Lead Vocalist, Visual
Jennie Leader, Main Rapper, Sub-Vocalist
Momo Main Dancer, Sub-Rapper, Sub-Vocalist
Jihyo Main Vocalist, Lead Dancer, Sub-Rapper
Lisa Main Rapper, Main Dancer
Chaeyoung Lead Rapper, Sub-Vocalist, Center, Maknae
Sub-Unit 02: SUNBEAM
Concept: Bright, Colorful
Members:
Nayeon Leader, Main Vocalist, Sub-Rapper
Joy Lead Rapper, Sub-Vocalist, Visual
Sana Main Dancer, Sub-Vocalist, Center
Rosé Lead Vocalist, Lead Dancer
Dahyun Main Rapper, Sub-Vocalist
Yeri Sub-Vocalist, Sub-Rapper, Maknae
Sub-Unit 03: ROYAL NOIR
Concept: Jazz, Elegant, Sexy
Members:
Irene Main Rapper, Lead Dancer, Sub-Vocalist, Visual
Wendy Main Vocalist, Sub-Rapper
Jisoo Lead Vocalist, Visual
Jeongyeon Leader, Main Vocalist
Mina Main Dancer, Sub-Vocalist, Center
Tzuyu Lead Dancer, Sub-Vocalist, Visual, Maknae