my fav setup is when the 2C,C combo (in air) is just plain works, there are two options I use after that.
PS: WHITE LEN = Slow as crap dashing, learn the super jump it really helps, its 214D9
PS: I always start Len combos in air if possible, note there are better ways to these combos its just often depends on who you are fighting and exactly where you activated your attacks these are just easy and very reliable.
Oppenent in air: 2C,C or just one of them if you don't think you can hit them both, then 214 B,214C,B,jump(if possible) then whatever is possible ussally A,C,236B works C then grab also often works as well, C then another 234B is nice too.
So here it is again against air
2C,C,214B,214C,B,C,jump(if possible),A,C,236B does about 3200-4000damage.
Oppenent on ground (may be different depending on size of char): 2C,C now there are too options here:
Ground combo time: if its a tall char use B after the first two hits to stop them from recovering then do what your normally like to do on the ground. I use 2B(one hit),C(both hits),4B, do your basic air combos now. Mine is B,2C,C,jump,2C,C,236B. 4000-5000 damage
2C,C,B(for tall Char),2B(one hit),C(both hits),4B,B,2C,C,jump,2C,C,236
Air combo time: before hitting the ground in that like few frames hit 214B,214C,A,C,jump, normally you can do some more hits on this one then the one above it if you time it right it really depends on the char A,C,236B is very reliable if you arn't sure. 4000-5000 damage
2C,C,214B(in air),214C,A,C,jump,A,C,236B
*Note is possible to C combo out of 214C just really hard for me at least iat must be only 1 or 2 frames. B comboing is much easier than C I suggest you try both of these as well for yourself.
Learn Bara/Bunker Cancel trust me her 63214C is very useful mainly because you can then follow my air comboing guide up higher and easily rack up at least 3000 damage. I personally like the 214C Bunker Cancel because its easier and you don't have to worry about messing up. the air combo.
Lens other moves hum, 236A and 236B obviously, along with B, and 2B for just keeping ppl away.
Personally I like 623A,4B, followed by air combo it can come out pretty fast if ppl don't see it comming, often times I do it right at the end of a back dash. On top of that it can get under some high attacks an example is warachia practice attack one goes right over your head while you are doing this move.
Im not a big fan of 623B mainly because is over used and its easy to block, something funny to do those is to do
623B,B(to cancel has to be at the right time.), then 63214A/C, just to catch them off guard, note this is kinad useless just funny.
Holding C in Air has its uses for the flying shot mainly it gives you something to do while running away.
Remember most ppl arn't use to white Len and that her forward and back dash (on ground) has invincibility for periods of time allowing you to dodge stuff then do something gay like a 214C before they get out of their attack animation.
Remember her ground dashs are slow jumping and dashing as soon as you leave the ground is often times a better idea for chasing.
holding 236A is cool but most ppl know what it does but its still very good for set ups, and chip damage.
alot of ppl keep mentioning 214A on ground yes that good for countering and combos but it has limited use otherwise 214B in air is better because it the only thing that can really continue a big air combo with white len when she is already in the air, the only cool thing is after doing a big ground combo you can easily do 214A,214C, then do the air combo by comboing after 214C, while I use it I vastly prefer not to constantly use my magic.