Sister of the Wong-Chang-Lee brothers (the daughter of their mother's 14th husband). She is more level-headed and comptetent than they are. She is a martial artist and also wants to find the treasure of Elpida, to which end she stole a submarine (which gets repeatedly confiscated by the Nereids and subsequently stolen again by the family). The submarine was named Agnes for their mother. Shizuka renamed it Yomogi-1.