I'm not sure if this is a basic game mechanic thing or not, but I found a really stupid trick.
Some characters can d-tilt then turn around while still ducking. Just hold the opposite direction while the d-tilt is out. After the attack, you will be facing the other direction. Samus, Mario, Pit, Dedede, Sheik, Squirtle, Ivysaur, Ike, Yoshi, Wolf, Ness, and Olimar can't do this.
This might be an odd buffering thing, but you can't switch direction while ducking normally. It has no advantages, since d-tilts always are in front.