Run off fast fall fair is amazing, we can interrupt fair and recover which makes this a viable option. This, trumps, flare blade, and aerials from the ledge are the meat of my offstage game actually.
I run off and grab the ledge while they're recovering, followed by dropping down into either a rising bair, nair, dair, or fair. Rarely I'll use nair to cover most of my space, although for the most part nair covers that well enough. Depending on how low you go, don't angle Blazer so you'll reach maximum height.
As for flare blade, I usually b reverse it out of a ledge hop and hit those who recover low and don't realize we can go fairly deep with this due to being able to act out of it quickly. I also use turnaround flare blade so I remain on stage, and time it for when they move from the ledge as it should cover all options on reaction barring rolls, which we can then quickly cover with a few options like ftilt, grab, nair and potentially other more effective things. Wave bouncing this out of a ledge hop is also an option for those who hug the stage with there recoverys, or for punishing ledge snap vulnerability. I usually use this out of a ledge hop as a mix upor rise with out ot of a jump for similar placement.
Lastly, I utilize trump->bair and something I call trump mind games, where you condition them to buffer a roll or jump and go for a hard read like pivot fsmash or nair.
Something I don't use as much but can potentially be just as effective is OoS Blazer, as it can also cover multiple options, essentially as a high risk/medium reward imo. I use oos blazer plenty otherwise though.
I have taken a lot of how I edge guard from my Ganondorf, and it's helped a ton using a style that revolves around grabbing the edge and effectively timing your attacks.
Also, hey Rango.