I’ll try my best
She has a decent walk speed and her wind roll is good for avoiding projectiles, just be wary of using it up close unless you’re gonna go into one of the follow ups. At a neutral game, you want to take advantage of her long reaching pokes such as cr.lk, cr.mk, and f+mk. On counter hit, f+mk causes a stagger that would allow you to jump in HK to continue a combo - the timings a bit weird, but just do the HK at the top of your arch and you should get it.
I’d say those with pokes just plain better than hers. In particular, Rolento and Dhalsim are a annoying pair to fight as you can’t wind roll past them.
great range on her normals, good normals in general, I see you’re familiar with her CADC PC ability. She’s just a good all around character.
Um… maybe for a juggling combo? ie. f+mp>lp, f+mp>mk xx windroll, cr.hp, tiger strike is a pretty decent 300+ damage combo. If you’re doing this on a grounded opponent, then cadc PC is probably the safer option (considering you can do it consistently). That said…
Windroll gives you access to one of Julia’s over head options, which can be used for a small combo, but my personally favorite mix up game is after scoring a Tiger Strike (whether it’s from cr.LK xx Tiger Strike, or one of the extended combos), use either swift Step (HCF+LP) or Step Step Explosion (HCF+HP) as SSE is an overhead that causes a crumple state and leads to a 400+ combo meterless. SS doesn’t nothing, but once you have your opponent training on blocking high, you go in and attack low… which currently meants cr.LK boost into your partner. Luckily in 2013, cr.MP will be able to link into itself (theoretically), so you’ll have a decent damaging low attack.
She’s not really Viper, but Makoto is probably more accurate. She’s a hard hitting female bruiser that can cancel some of her more unsafe attacks into PC. Alas, she has no Command grab. Some would say she’s like Yun with her lunge punch, but really that’s the only thing.
Glad to have helped. I don’t know how accurate my answers are, but these are merely based around my own experiences with Julia. If anyone has better answers or would wish to correct me. Feel free.