Actually, I don't know what tag would define this. Those supposed with short hair have long_hair and vice versa.

That'd be alternate_hairstyle.

i would say "THEN DOO EEET FAGGIT" but I already added the tag.

Kagami: "Hey, wait a minute guys, why am I the only one that doesn't have an alternate hairstyle?"
Misao: "Because you're special, Hiiragi va!"
Kagami: "I see... o_O"