The Dukuwaqa is a magical shapeshifting creature capable of transforming between a shark and a human form. It is most famous for serving as the official team mascot for the Fiji National Quidditch Team during the 2014 Quidditch World Cup. Its appearance at the tournament was notable for a dramatic and aggressive confrontation with the mascot of the Norwegian team. All known information about the Dukuwaqa comes from supplementary writings by J.K. Rowling. (Pottermore)
The only recorded appearance of a Dukuwaqa in the wizarding world was during the opening ceremony of the 2014 Quidditch World Cup, held in the Patagonian desert. As the mascot for the Fiji National Quidditch Team, the Dukuwaqa was intended to perform in a specially created lake alongside the Selma, the mascot for the Norway National Quidditch Team. (Pottermore) However, both creatures broke free of the containment spells placed upon them and engaged in a furious battle in the lake. The Dukuwaqa, in its shark form, fought fiercely with the serpent-like Selma, causing panic and chaos among the spectators. The fight had to be broken up by the security force from the International Confederation of Wizards, which was composed of Sasabonsams from Burkina Faso. (Pottermore)
The Dukuwaqa is a shapeshifter, meaning it can alter its physical form at will. Its two known forms are that of a large, powerful shark and a human. In its role as a mascot, it demonstrated a fiercely protective and aggressive personality, immediately attacking the rival Selma mascot without provocation. (Pottermore)
There are no known possessions associated with the Dukuwaqa.
The Dukuwaqa is the mascot and symbol of the Fiji National Quidditch Team, indicating a strong allegiance. It showed extreme animosity towards the Selma, the mascot of the Norway National Quidditch Team, which it considered a rival.
The name Dukuwaqa is a direct reference to Dakuwaqa, a prominent shark-god in Fijian mythology. In legend, Dakuwaqa is a guardian of the sea who can also change shape into a human. This mythological origin perfectly matches the creature's known appearance and abilities. The spelling with a 'k' is used in the official Pottermore text.