It would help if you explained what you look like.
some easy but fun cotumes.
Ranma. (Red sleavless, yellow frog knots, black pants and sandals.)
Shampoo, from Ranma(any chinese style dress, purple hair put in buns)
Naru, from Love Hina (most recognizable in orarnge shirt with "Salem) written on it, and green skirt)
Rei Ayanami, from Evangelion (school uniform might be easy enough to fake with clothes from value village or good will)
Asuka, from Evangelion(Asuka in her yellow sun dress, just find that dress)
Make Your Own Ninja, from Naruto. (Make a quick forehead protector and design a random ninja outfit)
I am assuming your a girl with all of these. if not I appologize.