Melody

Ariel is the main character from The Little Mermaid.

Film
Abducted by Ursula the sea witch in the climax and restrained by Flotsam and Jetsam.

Abducted by Morgana and taken hostage.

Television

 * S01E02 The Great Sebastian; caught in a net by sharkanians and chained in the hull of their sunken ship hideout
 * S01E04 Urchin; trapped in a small hut by the Lobster Mobster and held for ransom
 * S01E06 Message in a Bottle; stuck halfway under a giant clamshell and later bound/restrained in the tentacles of a giant sea anemone
 * S01E07 Charmed; nearly put into a sack by a hag-like creature and later groped and fingered by other monsters
 * S01E08 Marriage of Inconvenience; grabbed and nearly eaten by a giant crab-monster (thankfully, it was only a dream her friend Urchin was having)
 * S01E13 Trident True; trapped in a cage by a giant octopus
 * S02E02 Calliope Dreams; grabbed by the trail by a seaclops
 * S02E06 Wish Upon a Starfish; grabbed by a large crab and wrapped up in seaweed-like wrappings
 * S03E05 Heroes; stuck in slow sand, later lassoed and restrained with rope
 * S03E08 A Little Evil; tricked and caged in a small cave-like outcrop