Roseluck hasn't had much luck finding even a single changeling to romance.

The Detector had blown up on itself on its first test run.
The Bipedal-Changeling-Tracker-Bot kept trying to smash down her neighbor's door.
The Change-Fume had the unfortunate side effect of having a quarter of Ponyville write horrible love poems to her.
And, of course, one couldn't simply forget the Occulus.

But now, the Changeling-Finder is armed with Truth Dust and the resolve to succeed - Changelings, beware: when she gets her hooves on you, the hugs will never cease.

(Inspired by their positioning in the character selection window :D)