Pure Vanilla Cookie is just wholesome.
Hollyberry Cookie is a girl boss and likes drinking berry juice. She is really nice and supportive.
Dark Cacao Cookie is cold and serious. He is mostly chill but he can be scary when mad.
Golden Cheese Cookie is a fun girl and likes gold.
White Lily Cookie is quiet and very kind. She tends to be near Pure Vanilla Cookie often and is very clever. 

From CRK (before Dark Enchantress) 

Miku is the star of the group, cheery and charismatic. 
Rin and Len argue a lot
Gakupo is flirty with Gumi
Meiko and Kaito are dating
And Luka is the mom of the group
Gumi is funny

They randomly appear in your room!

Fukase: red hair, charming, funny, friends with Oliver.
Oliver: quiet, British, spiteful, likes dirt, friends with Fukase

Flower tends to have a hard time speaking English and mostly speaks Japanese, but can understand and sorta speak English. Without Fukase, she is calm and collected.
Piko is chill and basically the therapist of Flower and her friend/roomate.

~Out shopping~

The funniest squad.
Fukase is the meme lord.
Piko is dead but he chills with the squad.
Oliver is British and a child.
Flower is learning English with duolingo.