Paper Mario: Sticker Star
Birdo makes her Paper Mario series debut in Paper Mario: Sticker Star. Here, she appears in the level of W4-1: Snow Rise, on a giant swing as Mario comes to a cliff and hits a nearby tree. She will perform to him a short serenade and then give him the Goat, also warning Mario not to "get egg on [his] face" upon swinging away.
Birdo later shows up at the parade at the end of the game. She is shown in the three-minecart-chain with two Shy Guys for the Bowser's Snow Fort section of the parade winking at the player.
Paper Mario: Color Splash
Birdo appears in Paper Mario: Color Splash. She holds a concert in Plum Park, accompanied by dancing Koopa Troopas, before an audience of Shy Guys, Mario, and Huey. Her song lyrics reference her original Japanese debut game (Yume Kōjō: Doki Doki Panic), as well as Yoshi's Flutter Jump ability.
She also appears during the Balloons Thing animation, where she blows a kiss to the enemy to send them flying away. Birdo also appears during the credits slowly moving on her moon.
Birdo can be seen during the boss fight with Paper Ludwig, when Mario uses the balloon thing card, Birdo appears on her crescent shaped moon, lifting Ludwig's submarine out of the fight.
Paper Mario: Origami King
Birdo reappears in Paper Mario: The Origami King, where she first appears falling into the spring in Whispering Woods after Mario pulls on a nearby tree tug. Birdo later appears in Big Sho' Theater for a performance on the second stage. During the act, two Paper Macho Koopa Troopas fight over her while Mario battles them. Birdo even gives Mario a big smooch leaving him shocked, claiming it was a stage kiss. In the coffee shop at the Spring of Rainbows, Birdo will appear if Mario chooses the special, where she blows a heart into his mug as the Snifit's blow whistles at her in awwwe.