While chasing a Wisp, Merida meets Emma Swan, the Dark One. She befriends Emma, although when she overhears Emma seemingly talking to herself about killing Merida for the Wisp, Merida flees to the Hill of Stones. Emma tracks her down and when Merida tries to shoot Emma with arrows, Emma rips Merida's heart out and is on the verge of crushing it when Emma's family and friends suddenly arrive and convince her not to. Merida's heart is returned, and Merida eventually thanks Emma for seeing that she has darkness in her own heart as she planned to slaughter the other clans but now intends on giving them mercy in order to unite them. Some time later however, Merida is captured by King Arthur's forces and held prisoner in the dungeons of Camelot where she befriends Lancelot. They are both freed by Merlin, and Merida takes Belle to her kingdom to help Merida reclaim it. Eventually, Merida reveals herself to the rival clans and prevents her brothers' executions, winning back the people. However, when King Arthur returns with Zelena by his side, Merida seeks help from Mulan and Ruby to help her defend her kingdom. Following their victory, Merida becomes the queen of DunBroch, and is given magical ale by the Witch to speak with her father, before declaring vengeance against King Arthur.
In Storybrooke, Emma had been keeping Merida captive and rips out her heart once more, commanding her to teach a powerless Rumplestiltskin how to become the hero that will pull Excalibur from the stone. When Rumplestiltskin escapes, Emma instructs Merida to assassinate Belle. Failing this, Merida drinks a potion which turns her into a bear, although Rumplestiltskin uses a magic powder to revert Merida back into her human form. In exchange for Rumplestiltskin unsheathing Excalibur from the stone, Emma returns Merida's heart to her. Merida and the other people who came with the fourth Dark Curse eventually return to the Enchanted Forest.
- King Fergus (deceased father)
- Queen Elinor (mother)
- Harris (brother)
- Hubert (brother)
- Hamish (brother)
- She is based on the princess Merida from Brave.
- S5, E01: "The Dark Swan"
- S5, E04: "The Broken Kingdom"
- S5, E05: "Dreamcatcher"
- S5, E06: "The Bear and the Bow"
- S5, E09: "The Bear King" (flashback)
- S5, E10: "Broken Heart"
- S5, E21: "Last Rites"
- S5, E22: "Only You"