Gosh, it's really bothering me that so many people on Jref can't tell band members apart haha. Especially in a band that has such different facial features. I'm going to give you all a lesson in KuRt! Pay close attention, and study hard, cause there will be a test! (Okay, not really, but I'll tell you who's who and if you still can't tell them apart then there is no hope!)
Okay, in this photo, from left to right; Yuma (G), Oto (B), Tenten (V), Kiaki (D), Ryouki (G).
I believe Yuma is the one Kaine is talking about. He is the easiest to pick out since he has sort of an odd appearance. Tenten is pretty easy to spot as well. He usually sports the same hairstyle and has a long distinguished face. For Ryouki, just look at the cheeks! He has well defined cheek bones (or the puffed-up-blowfish-look as seen in the pic below haha). Kiaki has a set of lucious lips, lol this is probably the most ridiculous description, and it makes me look like all I do is study Jrocker's facial features all day. I assure you, I could describe their bodies in great detail as well j/k. Oto, poor thing, he is a cutie. At least now Saburou will be easy for you to pick out with the pierced lip!
If you need (or would like) more photos of the band for further "studying" just let me know!