Jeni Courtney portrays the courageous and curious Fiona, the young girl at the center of the story.
Eileen Colgan plays Tess, Fiona's grandmother, who shares stories of their family's past that inspire Fiona's journey.
Mick Lally portrays Hugh, Fiona's grandfather, who holds the key to the family's connection to the magical creature.
John Lynch portrays Tadhg, a mysterious man who helps Fiona uncover the secrets of Roan Inish.
Pat Slowey plays the Priest, a character who interacts with Fiona and her family, providing guidance and support.
Dave Duffy portrays Jim, a local fisherman who may have insights into the magical creature's existence.
Declan Hannigan plays the Oldest brother, a member of Fiona's family who contributes to the folklore surrounding Roan Inish.
Richard Sheridan portrays Eamon, another member of Fiona's family who plays a role in the unfolding mysteries.
Micheal MacCarthaigh plays the Schoolmaster, a character who interacts with Fiona and provides knowledge about the local history.
Fergal McElherron portrays Sean Michael, a member of the community whose stories add layers to Fiona's exploration of Roan Inish.
Brendan Conroy plays Flynn, a character who may have connections to the magical creature and the secrets of the island.
Frankie McCafferty portrays Tim, a character who interacts with Fiona and plays a role in unraveling the mysteries of Roan Inish.
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