Do Bon (King Zora) Poker Card
Do Bon the third is the official name of King Zora, father of Princess Ruto and Prince Ralis, husband of Queen Rutela. According to Eiji Aonuma.
The thing he's holding between his fingers is a Zora Scale, as he is the creator of the Zora armor, which is made out of Zora Scales.
All the cards of the Heartpieces suit: