Serena is essentially a mermaid, but her bottom half is that of a shark's tail. Her skin has the same color and texture of a shark's. Quite shy towards anyone that isn't like her. Usually a very sweet girl that likes to collect whatever she finds on the ocean floor. (Whether it be rocks, human items, or shells.) However, smelling blood causes her to go into a frenzy of sorts, even if she tries fighting it. Will nibble at you if she's feeling affectionate.