Girls' Generation (and one lost Red Velvet member) as kids in a daycare. 

Students: 

Taeyeon(6) is a dork who carries around a pea stuffed toy and has at least two packs of gummy worms in each of her pockets.

Jessica(6) is the resident Princess in the daycare. She wears a crown everyday. She has a younger sister who is only one year old. (She's extremely jealous of her younger sister because she gets all the attention now.)

Sunny(6) is the human punching bag. Why? She has too much aegyo and has chubby cheeks that everyone loves to pinch. 

Tiffany(6) is the Pink Freak because she's always wearing or carrying something pink.

Hyoyeon(6) is the violent one. 

Yuri(6) the kkab who talks to herself all the time. 

Sooyoung(5) is the shikshin who will always have cookies or chips in her bag. She steals people's food. 

Yoona(5) the prankster who pranks everyone including the teachers. Second shikshin because she eats practically everything in sight (even inedible things).

Seo Joohyun a.k.a Seohyun(4) the teacher's pet because she is the only innocent and normal child. Not only that, she's a major nerd and has a new book in her bag every two days. The only thing abnormal about her is her addiction for sweet potatoes. 

Bae Juhyun Irene(4) is the girl who is crazily obsessed with Teacher Wendy (because she thinks Wendy is her imaginary friend, Seungwan).