This is Cassie: Animorph Girl and Makaila Kelsey: Dolphin Girl. Cassie is holding the blue box a.k.a. the Escafil Device that gives the Animorphs their morphing powers. Makaila has a very pretty dolphin necklace and sparkly blue eyes that match the ocean.
Erin, the girl that made this dolphin girl for me, has become a great e-mail friend! I thank her for creating this.