Tiara

Tiara is a supporting character in Super Mario Odyssey. She is a Bonneter, and lives with her bigger brother Cappy in the Cap Kingdom. She is kidnapped by Bowser to be used as Princess Peach's headdress in their wedding, prompting her brother to team up with Mario and his friends to rescue both damsels.

After the game is completed, Tiara begins exploring the world with Princess Peach, much like Mario and Cappy.