I need everyone's opinions, suggestions etc. I'm creating a TWICEBLACKVELVET OT18 girl group using the NCT system

Hello everyone my three ults are TWICE, BLACKPINK & Red Velvet they are why I'm a Kpop stan and I wanted to turn them into a OT18 girl group using a system similar to NCT and LOONA. This is their OT18 profile:

Their profiles:
Irene: Leader, Lead Dancer, Sub-Vocal, Sub-Rapper, Visual, Center

Seulgi: Main Dancer, Lead Vocal

Wendy: Main Vocal, Sub-Rapper

Jisoo: Lead Vocal, Visual

Nayeon: Lead Vocal, Lead Dancer, Sub-Rapper

Jennie: Main Rapper, Lead Vocal

Joy: Lead Vocal, Lead Rapper

Jeongyeon: Main Vocal

Momo: Main Dancer, Sub-Rapper, Sub-Vocal

Sana: Lead Dancer, Sub Vocal

Jihyo: Main Vocal, Lead Dancer

Rosé: Lead Vocal, Lead Dancer

Mina: Lead Dancer, Sub-Vocal, Visual

Lisa: Main Dancer, Lead Rapper, Sub-Vocal

Dahyun: Lead Rapper

Yeri: Sub-Vocal, Sub-Rapper

Chaeyoung: Main Rapper, Sub-Vocal

Tzuyu: Sub-Vocal, Sub-Rapper, Visual, Maknae

List of fixed subunits:
TBV: Joyful (a unit similar to Orange Caramel)

TBV: FIERCE (a unit based on groups such as: 2NE1, NCT 127, SKZ)

TBV: Enchanté (an elegant unit)

Unfixed units:

TBV: U (obviously inspired by NCT U)

Sub Unit profiles:

TBV FIERCE

Members:

Concept: Bad Ass, Hip Hop, Girl Crush

Irene - Leader, Lead Rapper, Lead Dancer, Sub-Vocal, Visual, Center

Seulgi - Lead Dancer, Lead Vocal

Jennie - Main Rapper, Sub-Vocal

Jeongyeon - Main Vocal

Momo - Main Dancer, Lead Rapper, Sub-Vocal

Jihyo - Main Vocal, Lead Dancer

Lisa - Main Dancer, Main Rapper, Sub-Vocal

Chaeyoung - Lead Rapper, Sub-Vocal, Maknae

TBV Joyful

Concept: Cute, Youthful

Members:

Nayeon - Leader, Main Vocal, Lead Dancer, Sub-Rapper

Sana - Main Dancer, Lead Vocal, Center

Joy - Lead Vocal, Sub-Rapper

Rosé - Main Vocal, Lead Dancer

Dahyun - Main Rapper, Sub-Vocal

Yeri - Sub-Vocal, Sub-Rapper, Maknae

TBV Enchanté

Concept: Elegant

Members:

Irene - Leader, Main Rapper, Lead Dancer, Sub-Vocal, Visual, Center

Wendy - Main Vocal

Jisoo - Lead Vocal, Visual

Mina - Main Dancer, Sub-Vocal, Sub-Rapper

Tzuyu - Sub-Vocal, Sub-Rapper, Visual, Maknae

Irene is in the first and third subunits because I feel like she fits both concepts.

Quote from Water_oWl

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