what are the red velvet members nicknames

I don't know why 你 are asking this in a SNSD 粉丝 group but

Irene: Baechu, The 2nd Tiffany, and Hyun-ah :3

Seulgi: Seulgi-Bear, Kkangseul, GomDoli and Teddy 熊 :D

Wendy: Olaf and Wan-ah :P

Joy: Doongdoongie, cute Joy, and Malgeumi :o

Yeri: Squirtle, Yeriana, and Malgeumi (like joy) <3