Well the sword length depends on what picture you are taking it from. In some of the artwork, it looks about Nariko's size, but in some of the in-game shots, it looks smaller. I based mine on some of the artwork, but if I re-made it, I would probably make it a little smaller so the the magnets would hold the sword together better.
Nariko (Heavenly Sword), Rikku (FFX, Berserker, Black Mage, Samurai, Songstress, Detroit Red Wings), Catwoman, Astrid (HTTYD), Sango (Inuyasha)
Possible planned cosplays:
Something from Breath of Fire 2, Fire Nation Katara (Avatar), Dark Knight Rikku