Hmm. I'm in the middle with this off-stage business.
True, Zelda doesn't have many moves that are good for edge-guarding and such, but the ones that she does are killer. Her air dodge seems to take twice as long as most characters, so I find it easy to position myself in a good place for a lightning kick with that. All her aerials are killers, which is good - but like rageagainst said way back, you get screwed badly when things get sour.
I think some characters are harder to off-stage pwn than others.
Anyway, Nakayorz... basing this solely on the video "Zelda (Naks) vs Ike(Ryko) FD 0302 part 4"
Your approach-forcing game is great. Almost flawlessly so. Improvements could be made with your approach though.
At one point early in the game, you only grabbed. 10 straight times. The result was a relatively mild punishment, but Ike was at a high percentage. You should have gotten a little more aggressive, and just went in for the u-tilt or d-smash. He got you to 79% when you could have killed at 0%.
Dins were used a lot. I can understand that this is necessary to get him to come to you, but it makes you a little predictable. I think sometimes it's good to mix things up with an approach from your side too. You have a tendancy to hit him hard, then retreat and repeat. Follow ups are key to early KOs. When you f-air sweetspot, run after him. There's nothing he can do while he's flying away - jump (dodge if necessary, while he aerials)/Din from the edge, and go in for an aerial then FW back to get some space.
Ike is a slow opponent. Take advantage of this. Space yourself well, wait for him to charge at you, and FW behind him, out of his swords range incase he charges a Usmash or something, and then charge in yourself before he can swing again. If you're unsure, just fake a charge by spot dodging until he finishes swinging then go in. iirc, every time you used FW, you tried to hit him with it. iirc, he punished each time. Try to get as good with FW as you are with Din.
Alright, well, that was a mouth full of heavy criticism. Please don't be insulted or anything, that is not my intention, and I don't mean to come off a little conceited and full of myself - I have my share of things to work on too. You are definitely a good Zelda, and have obvious strengths, but so too there are obvious weaknesses. I tried to point these out as things to work on. Sometimes I strung together specific moves. This is just a loose general guideline. Improvisation is everything. You never want to do the same things over and over again.
Goodluck :D