I recall there was video by Okayu where she talked about how she first met Korone. Seems Korone used to be very quiet and shy something you wouldn't think when watching her lively streams.
*sigh*I'm... Inugami Korone... Pleased to make your acquaintance...She's such a docile girl.To be frank...Inugami-san.How about we hit the karaoke with everyone once we go home?I'm... I'm sorry...I didn't think I could get along with her.