Riku Family

The Riku Family is a royal bloodline which ruled the Dressrosa Kingdom since eight-hundred years ago, until ten years before the current timeline. It was one of the new royal families after nineteen of the twenty kings that founded the World Government left their kingdoms with their families to live in Marijois.

Members
The only members known so far are Rebecca, Scarlett and Riku Dold III.

Past
Eight hundred years ago, the Riku Family became the new rulers of Dressrosa Kingdom, after the Donquixote Family left the country to live in Mariejois.

Ten years ago, a member of the Donquixote Family, Donquixote Doflamingo, came back to his clan's original kingdom and ousted the Riku royalty, regaining the king status. Dold, the current king of Dressrosa, had to give up the throne, due to an accident, and was forced into hiding. That led the people to believe, that hteir king abandoned them and soon started to despise the whole Riku family. The king's daughter, Scarlett, was killed soon after, leaving Rebecca as the sole heir to the Riku Family.

Dressrosa Arc
At some point in the past, Rebecca got arrested by the Donquixote Family, and she was forced to fight in the Corrida Colosseum as a gladiator. Although, she is quite strong and has survived many battles, she still receives a lot of hatred, due to her heritage. Currently, Rebecca is competing for the Mera Mera no Mi, and is part of the D Block.

King Dold, who is presumed dead, also fought for Ace's fruit, under the Alias "Ricky", in Block B. After he lost the fight, he was brought in the underground secret facility, along with other strong fighters who got defeated. There, his true identity is revealed, and he receives his old subordinates' and allies' praises.