I don't know if this has been discussed, but I saw someone suggest Impa as a Sheik/Link echo and I thought that was a great idea. Here's how it could work:
She would use the giant blade from Hyrule Warriors and she'd be mainly based around Sheik (obviously) but a bit slower if possible, and she'd take the following moves from Link:
- All of Link's tilts
- FAir: she would only swing the sword once so, only the first hit of Link's FAir.
- All of Link's smash attacks: same as above, she would only use the first hit of those moves expect for down smash were she would use the two hits (obviously knockback would have to be adjusted).
All those moves would have water effects (just visual stuff). I wouldn't use Link's DAir or Uair because those are very specific to Link and his sword and she could look like Cloud using that DAir and I don't think it fits her.
Then she could use a kunai throw instead of Sheik's needles as many of you probably have suggested (I haven't read the whole thread, too long). I know that depending on how they built echoes this could be unrealistic (although Chrom's aether was slightly Luigified so it should be possible). If anything, they could at least add water effects and make the needles bigger, visible, and kunai shaped, even if the effect is exactly the same and those are only visual changes. Better than nothing. And lastly, if they are really generous she could use a slightly decloned deku nut for her side special instead of the burst granede (this is a bonus but I'd be fine either way).
Also, her appearance could be a mismash between Hyrule Warriors and Skyward Sword since we probably cannot have both, using HW as a base and then add the cape and some details from SS (someone suggested this before too).
So, putting all this together, how would you feel about Impa being implemented as an echo this way?