Slideoff into waveland back onto platform is a great mixup i've been using lately. Most opponents will expect you to slideoff to the ground and will cover that area, which gives you space to take back center. It can be especially good after lightshielding or across the stage.

If you press Z within the first 3 frames of performing an airdodge, you will automatically grab any item coming your way for the next 8 frames. This makes it an excellent way to grab bombs, and I’m pretty sure it’s possible to do this on reaction as well!

How to get frame perfect turnarounds in teeter: a poor man's pivot tilt.

Marth can option select a tech during his side-B stall (3f vulnerability). If he doesn’t get hit, he grabs ledge; if he does, he keeps his jump. Strong vs rising hitbox up-Bs and for ledge refreshes where you expect them to do an aerial.