*Tiara Boobowski, also known as Tiara Cyberooski or Princess Tiara, is a character that was set to appear in the Sonic the Hedgehog series. She is an anthropomorphic Manx cat created by Chris Senn, the lead designer for Sonic X-treme. One of the four characters originally intended to be playable, Tiara was dropped when development difficulties enforced the team to focus solely on Sonic the Hedgehog. Later, she was worked into three of the game's potential story lines.

Chris Senn intended for her to be a love interest for Sonic in order to add romantic tension to the story. He had hoped that the story would show Sonic meeting his "match" in Tiara, but the stories the team developed had to focus on bringing together the levels and supporting a basic premise of good against evil.

Tiara is an anthropomorphic Manx cat with orange fur and peach skin. Her eyes are blue, and her brown hair is worn in a ponytail. Like the typical Manx, she does not have a tail. She is depicted with a noticeable eyelid crease, a design element rarely seen on other Sonic characters. Her attire consists of a bandeau top, tights and sneakers. She also wears white gloves with bracelets for cuffs.*