@@japankawaiicute1 True! She's whatever you headcanon her to be. C: To be honest I don't really know what she'd be since she isn't real, but I think her and Luka in this short are cute.
Oh it's because of their character items! See, Miku's is a negi (spring onion), and Luka's is toro (tuna), put them together and you get negitoro! There's also a sushi called negitoro, which is made from tuna and spring onion ^^