Speaking of Krystal in Smash Bros, we've got some interesting projects going on at GAMEBANANA, a gaming mod community.
First up, there is a skin available for Super Smash Bros (Wii U) that replaces Zero Suit Samus's mesh with that of Krystal from Star Fox Assault. Creator NEOFilly says that although the skin doesn't have facial or finger animations working, the skin is passable for use right now. It was NEOFilly's first mod. Visit the skin page for more photos and the download link.
64iOS even made a video showcasing this skin (and a few others). You can see from the video another area that could use some improvement: the tail has no physics, which makes sense as Samus doesn't have a tail.
Thanks to Smokey for the heads up.