I have a challenge for Krystal moveset makers. Make a moveset that is NOT related to StarFox Adventures in anyway. Is it possible? Yes. Would she still be interesting? Probably not.
While it would be fantastic to have her use a staff as her main weapon, she, as a character, is not very interesting.
Alright, I'm gonna top you right there. How does her character relate to how interesting her moveset would be? I mean, Mr. Game And Watch has the personality of an alarm clock, and they made a rather unique moveset for him just based off of things from his various games.
In that sense, asking one to make an interesting moveset for Krystal that A: Hasn't been done, and B: isn't from Adventures, is simply not a fair request to make. Adventures being really the only game in the series where Arwing combat wasn't really much of a thing, the next two games she was in had her piloting an Arwing, (well, Arwing in Assault, and custom machine in Command, but you get the picture).
In a series were almost all of the games give each character the same suite of gadgets, you are asking us to take a character and ignore the one time that she was given something that would set her apart, and then saying "See? There's nothing that sets her apart".
And that has
nothing to do with how interesting you think she is as a character, and everything to do with what interesting
abilities she has.
Yeah, you could make a set of powers based off of Assault's ground weaponry (grenades, chain gun, Sniper Rifle), but why limit your choices when there's already a unique weapon that belongs to her, fits with her aesthetic, and has moves ready to go that don't require any reaching, like Fox and Falco have for half their special moves?