Goldfishie is Andrew Brewer's pet goldfish.
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Andrew got Goldfishie at the same time as Karen Brewer got her pet goldfish, Crystal Light. Goldfishie appeared in Baby-Sitters Little Sister #16, Karen's Goldfish. After that, he has only been mentioned. Sometimes in various chapter 2's Karen will say that he's a different animal and say she's joking.
Goldfishie and Crystal Light the Second get married in Beware, Dawn!.