So, I started thinking about Lee and how he can't use ninjutsu or genjutsu, which got me to wondering...
Can he do some of the advanced genin techniques, such as walking on water or climbing up trees? Besides the filler episode where he was clinging to the celing, I haven't really seen him do or fail at either of these things, so, it's just a guess.
Personally, I think he could... if the hand sign most people make for molding chakra to the feet is just for aiding in concentration and isn't an actual sign.
Which then makes me think that he'd have a hard time breaking out of a genjutsu, because in orser to do so, one has to use a hand sign, don't they? Unless... he could have to rely on a modified version by opening a gate or something, because that would displace his chakra properly, wouldn't it?
I come to you for opinions, fellow Narutards.
Edit: I have found proof! I spent a little time looking last night, and thanks to
chibi_lothlen, I found the chapter I needed. In chapter 262, he does in fact walk on water. Here's the picture, cut for convinience and a possible spoiler. Maybe? I cropped most of it.
( Lee can be like the J man too, guys! )