Okay for 'The Eun Gyeol Complex' the main characters are:

Cha Eun Gyeol

Kim Meekun

Shang Kyung Soon

Kang Mun Hee

The main characters for 'Harajuku Dance Rock' (my not written yet fanfic) are:

Miku

Ashe

Yuna

Tetsuya

(i know i know, two of them were in hana kimi, but it just works for this fanfic okay? Plus this way you can fangirl/fanboy over both of them! :3 )