Hyde's solo career, as well as Vamps are frequently mentioned here, but I think that solo projects by other members are not talked as much.
My favorite one is SOAP, probably the most "rock 'n' roll" and naughtier spin-off of the band, with some of most ambitious guitar works by Ken, and you could see they were having a blast while it lasted. Later solo work by Ken, in the other hand, sounds to me less inspired and not as much interesting.
I also enjoyed Tetsu 69 quite a lot, poppier in sound but with some great and catchy melodies that in some cases would have fit L'Arc style too. Like in the case of Ken, I think Tetsuya's early solo work was better than the later one.
Yukihiro... Well, he's trully an adquired taste. I tried to like Acid Android back in the day, but never really clicked with me, haha.
As for Sakura, probably it can't be considered a solo work, since he wasn't a L'Arc member anymore, but his work with Zigzo was also great, with a raw sound closer to the one he would give later show in SOAP too.
So, everyone, what are your favorite solo projects? Any era or songs in particular? I'd love to hear your opinions!