Merith is an inhabitant of Kyrandia and friends with Brandon. After Brandon healed the sick willow tree near The Temple of Kyrandia , Merith showed up and seemed impressed. He then asked Brandon if he wanted to play, telling him about a marble he found. Brandon told Merith he was unable to play at the moment but asked to see the marble. In response, Merith said if Brandon wanted to see it, he needed to catch him first and ran away. Brandon reluctantly followed.
Merith eventually hid behind a tree but was mistaken about the direction Brandon would approach from. Brandon snuck up behind him and tapped his shoulder, startling Merith and causing him to jump high into a tree. Brandon told him to let go of the branch, telling Merith he'd catch him, but then just let Merith fall to the ground. As Merith landed, the impact caused him to drop the marble. Angry, Merith told Brandon he could have the marble and left, saying he wouldn't play with him anymore.
The "marble" turned out to be an important fixture of the Silver Altar where Brynn instructed Brandon to place the Lavender Rose. By vandalizing it, Merith effectively broke the altar. Fortunately, it magically repaired itself when Brandon reaffixed the piece, causing the altar to glow and hum with magic once more.
Merith was neither seen nor mentioned in either of the sequels.