|“||Aphros: "We have trained all the famous mer-heroes! Name a mer-hero, and we have trained him or her!"
Leo: "Oh, sure. Like…um, the Little Mermaid?"
Aphros: "Who? No! Like Triton, Glaucus, Weissmuller, and Bill!
"Oh." Leo had no idea who any of those people were. "You trained Bill? Impressive."
Bill is mentioned by Aphros and Bythos as one of the many mer-heroes trained at Camp Fish-Blood, despite Leo Valdez not knowing any of them. However, Leo fakes a surprised expression when he hears about Bill. After Aphros and Bythos are done questioning Leo, Hazel Levesque, and Frank Zhang, they agree to send a group of mer-people off to Atlanta on a quest to rescue all the imprisoned sea creatures there, with Bythos suggesting Bill go on the quest and Aphros agreeing. It is later said that the creatures being held by Phorcys at the Georgia Aquarium were freed.
- He possesses the standard abilities of a merman.
- Aphros trained Bill himself in music, poetry, life skills, and homemaking.
- Bythos suggested Bill for the quest in Atlanta, meaning he may also be skilled in combat.
- Really good with the sword