So while I believe Birdo is a far shot as of late, I created a move-set for the frilly thingamajig! Take a look!
NEUTRAL - SUCTION SNOUT: Birdo begins inhaling via her snout. Said inhalation can vacuum items, projectiles and even opponents before spitting them out.
SIDE - BIRDO ROLL: Birdo retracts into a bowed Birdo Egg and starts rolling about. One of the few moves that directly imitates Yoshi's.
UP - BIRDO MOON LIFT: Birdo hops onto a cardboard moon lift, ala her performance in Color Splash, and rises upwards. Perhaps the lift can spin around to deal additional damage?
DOWN - INFATUATE: Birdo strikes an irresistible pose. If an opponent strikes during this time, Birdo will siphon some of the opposition's health away. Love makes you do strange things.
FINAL - LIGHTS, CAMERA, ACTION: Birdo begins to perform a showtime dance, all the while spotlights float around the stage. Pressing the B button will make the spotlights stop in place, making explosions occur under the spotlight's shine.
As if it wasn't obvious already, consider me a supporter