Hi, i'm looking for some LIGHT J-rock bands. L'arc en ciel, the gazette, sug, ScReW , DEATHGAZE , Lynch, meth, SKULL , Sadie , Suicide Ali , UnsraW , DELUHI, Eat You Alive , Versailles, The GazettE or other bands like that are too hard to listen to for me. no visual key and no heavy rock please :) I'd like to know if you know other bands like ONE OK ROCK or SPYAIR or BACK-ON or MONKEY MAJIK :)
As far as i know Visual Kei is a way to dress yourself and wear your hair and makeup and has no specific music genre so i'm not sure if you'll like these ones ... D=Out! Nightmare Vamps AnCafe (but they have a popish feel to it somehow, quite addictive though) and maybe Girugamesh ... but they might be a bit too hard, well at least some songs ^^
My favorite is ikimono gakari.



if l'arc en ciel is too heavy for you i think you probably want to look up jpop rather than jrock. not all jpop is boybands and morning mesume, there's some good stuff out there that would probably be more to your liking. try spitz http://www.youtube.com/watch?v=08_z8PBoFIc
i don't listen to J-rock a lot, but my favorite band is B'z. and I recently found Spitz which seems to be really good too (according to my taste).
First, I've got to say that I don't know a lot Japanese music, so my suggestion might be terribly wrong (I can't compare it to most of the names you mention), but I like many songs by Janne Da Arc, for example this one: https://www.youtube.com/watch?v=VBjsdGiCAMo
Just like you, I don't like bands that are "too hard" but I don't know if we draw the same line. (I've listened to a few songs by L'arc en ciel that I liked.)

I just tried Spitz, thanks for the suggestion. :)
I listen to Radwimps and HaKU and they are fantastic! You gotta try them
Try Yuzu, the brillant green,flumpool, orange range and Flow :)
Alice Nine That's all I can remember right now.
Plastic Tree is a great band. :)

*edit* Crap, you said no visual kei. Sorry.
One Ok Rock, Royz, The GazettE, Blue Encount, L´ arc en ciel etc
I wanted to reccomend One Ok Rock, but as I see you already know them... Well, they rock :D
hımm I guess bands have good songs / bad songs. Can not root for any band saying they are perfect, except for Luna Sea I guess...So how about trying one of this songs, and find out if they are your taste. I personally would highly recommand Luna Sea, but I second the suggestions B'z, Mr. Children, Radwimps, (do not know all of their songs, just one or two, but I think they are so called soft rock) By the way , you can also give a try to Kat-tun's rockish songs (like real face, rhodesia, butterfly, no more pain, don't you ever stop) well, here are some examples:

http://www.youtube.com/watch?v=A2SGIY4g3Dw

http://www.downvids.net/kat-tun-rescue-476981.html

http://www.youtube.com/watch?v=6A0_nCR98MU

http://www.youtube.com/watch?v=AFma39X_SCI

special thanks for other advisers, for maeking me find out "spiz", they seem interesting
I'm surprised no-one's mentioned Uverworld yet- I love them so much right now
https://www.youtube.com/watch?v=y2QCB_rq6-w&feature=youtube_gdata_player

I'm not sure if Sekai no Owari were mentioned but i really like them their more popy-rock though
https://www.youtube.com/watch?v=Mi9uNu35Gmk&feature=youtube_gdata_player

Nico Touches The Wall, their more like flumpool (which I second btw)
https://www.youtube.com/watch?v=P4mYGxuq7ro&feature=youtube_gdata_player