In response to the two things Wasp said here, even if Krystal was a side kick that doesn't hurt her chances at all because we have Luigi, and Krystal has been in three out of the four Star Fox games, 6 if you want to count 64 and it's remake so Krystal is just as relevant as the other Star Fox characters.
Luigi and Krystal aren't comparable in any form. Yes she's been in several games but what did she do in those games again?
Adventures:
-playable for 10 mins in a game that takes a few hours to complete with Fox because Krystal gets trapped in a crystal.
Assault:
-Uses her signal/sensor powers for a brief cut scene in a game where sensor technology is a standard in the series, making her magical powers useless.
-Eye candy for Fox and Panther
-Isn't the best multiplayer character
Command:
-She wants attention
-Fox says no
-breaks up with him
-gets laughed at
-joins Star Wolf for ultimate break up revenge
-leaves Star Wolf, changes her name to Kursed, and becomes forever unrecognizable
-The series forgets what her original goal was: to find the truth of her parents' death, and throws it out the window
Can someone explain WHY she deserves to be in Smash rather than Slippy, Peppy, Pigma, Leon, Panther, Andrew or even Andross 64? The staff isn't a good answer because there are other characters that fight with those like Dark Pit, Palutena, and maybe Bandana Dee with his spear.