Delfi is the Dolphin Princess, who once travelled for many months with her parents. After her big journey, she received a big party when she returned to school. During her travels, Delfi saw amazing things in Salacia and on Dryland, which her parents requested to keep secret. Because of this, no one knows what Delfi saw, not even the curious Ester. Maybe it's better this way...

Delfi also seems to know about aquariums and oceanariums. She describes them as "big cages for dolphins" where Drylanders teach tricks to them so that other Drylanders can watch, however, she can never understand why.

Delfi is 8 years old and has the Zodiac of Pisces (♓).