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. Much like Cappy, Tiara's main body resembles that of an Eerie. Similar to her brother's normal form resembling a top hat, Tiara, true to her name, resembles a bridal tiara. She is kidnapped by Bowser to be used as Princess Peach's headdress in their wedding, which is seen in the beginning of the game. This prompts her brother to team up with Mario to rescue both damsels.

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

Concept and creation
Tiara's final design has a veil similar to the one worn by Princess Peach. She was given facial expressions similar to those of her older brother Cappy.

Super Mario Odyssey
Tiara appears as one of the damsels in distress in Super Mario Odyssey. She was kidnapped by Bowser to be a headpiece for Princess Peach when Bowser forcibly tries to get married.

Mario Kart Tour
Tiara makes a cameo appearance in Mario Kart Tour as the headpiece for the Wedding Peach costume during the Peach Tour.