The L.O.L. Surprise Tweens Mermaid Serena Finn fashion doll features a color-changing tail that shifts from magenta to deep purple when submerged in cold water, including a light pink fin that also transforms. The doll has a movable fin that swings back and forth for interactive play. Included accessories consist of sea shades, a sea shell tiara, and a pearl belt for styling. With articulated joints at the waist and legs, the doll can be posed in various positions, including sitting and standing on her fin for stability. This doll is part of a series of four—Cleo Clove, Lola Waves, Lana Marine, and Serena Finn—for collectors seeking a complete mermaid set.