There's exactly 4 people on this account. Also, I'm the creator of this account! I'm Milla! Nice to meet you. 

Milla - Story plotter / Planner + 5th and 8th arc writer.
Sunny - Main writer of the 1st and 2nd Arc
Mae - Character designer + Writer of the 7th arc.
Sand - Speech writer + Writer of the 3rd and 4th arc

If you have any questions you can talk to me! - Milla

We all have discord but Sand is the most active. Her discord is @jingliuandsusannahobsessed