Trilliant appears solely in the film *Futari wa Pretty Cure Max Heart: The Movie* as one of the Courageous Warriors protecting the Garden of Hope. His mission involves aiding the protagonists in safeguarding the Diamond Line, vital jewelry worn by the Garden of Hope's queen during an annual ceremony to replenish the kingdom's water. The theft of this jewelry by a witch imperils the Garden of Hope along with interconnected realms like the Garden of Rainbows and the Garden of Light, risking the resurrection of the Dark Lord.

Visually, Trilliant possesses a lilac, frog-like form with large dark purple eyes and spiked purple hair. He wears small glasses, a purple outfit, and a violet cape fastened by a triangular amethyst jewel. His name combines "triangle" and "brilliant," reflecting this geometric accessory.