Ceto is a mermaid found in the underwater section of Fossil Island. She allows the player to enter a fishing zone to catch fish shoals provided they have a drift net. She will also take 200 numulites to allow the player to enter an instanced zone of fishing for a whole day, or 20,000 for permanent access.
She has a niece named Annette, who is found inside the fishing zone.
Ceto will randomly say these quotes aloud.
- I'm kraken me up.
- Why so sea-rious?
- Who needs friends when you have anemones?
- Twolegs are so shellfish.
- Oh the huge-manatee.
- Her Why so sea-rious? pun is a popular reference to a line from The Joker from the film The Dark Knight where he says Why so serious?.