Luca is one of the mermaids from Mermaid Bay who had signed Queen Otohime’s petition. Hody Jones read her name during his speech as he explained that the signatures would now serve as a list of traitors for him to deal with later. Luca was clearly frightened when she heard this.
|This article contains information that only comes from the anime, not the manga.|
For more information on this, see Filler Episodes.