Mariana

Mariana was a mermaid and a friend of Litrasaurus.

Now, when Dodo sent a message from Mauritius to tell them that a container ship full of books (which were going to be destroyed by Extinctus), was heading towards Perpetua she used her magical voice, which could lure sailors far and wide, to draw the ship towards her rather than Extinctus' Tower.  She and Didi Dolphin planned to rescue the books and take them to the safety of Litrasaurus Cave.  There they would be kept  in his wonderful library, where Christopher would carefully place them on the shelves for everyone to enjoy and share, safe for ever.