Adella (voiced by Tara Strong) is the third daughter of King Triton and Queen Athena. In the prequel film, she is boy-crazy, and wishes to dance with, and later kiss, a boy.
- Her name is a feminine form of "Adam".
- Adella is 19 years old.
- Her sisters say she's boy-crazy.
- Her pet peeve is when Andrina makes fun of her.
- Her favorite genre of music are romantic ballads.
- Her favorite musical instrument is the violin.
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