You can dair, waveshine, usmash opponents who fall from the shine if you have enough momentum. (While they are sliding on the ground)
Dtilt ftilt, and even nair work in this same fashion. Dair, waveshine, SH nair (tip of nair hits and pops them up). Grab?
If you want to catch ICs or Luigi with waveshine combos there are a few things you can do. Mind you, they aren't legit combos, but they might work.
-shine JC illusion->aerial. Don't do this vs. ICs. If you miss one of them you're ****ed.
-waveshine, run in close and shield. Wait for something and shieldgrab. If they don't throw out a move, jump and do another aerial and continue pushing them off the stage. Once those low traction *****es get thrown off the stage its done.
-waveshine->dtilt. If you max range the dtilt it sometimes catches them or goes under the shield. This works alot better at low/mid percents where uair will combo afterwards.
-waveshine->fullhop aerial. Assuming they don't crouchcancel and get hit, or they are in shield, this is a relatively safe followup. (Shine protects your ***)
If they get smart and try to CC or jump and hit you out of your Fullhop:
you've now just trained them to expect a certain follow-up. Mix up time.
-shine->turnaround->wavedash backwards. This is best used near an edge, when the shine doesn't knock them off the stage. If it does, forget the turnaround and run off and shine again. If not, this helps you quickly get your back turned and lets you zone them with bair. It has enough priority and range to rack up damage and/or knock them off. Shine/buffer rolls to protect you if you miss any of your spaced bairs.
These probably aren't as useful as I thought but once I started typing it was hard to stop.