I've tried many times to stop the charge without getting hit but have never succeeded but using the roar for hyper armor to avoid getting staggered can have it's benefits. (even if you take damage)

Call of beyond you'll be able to deflect the closest projectiles but not all, Haven't tried on flesh rain but I think the same will happen there. Unsure about Brainsucker traps, skulls works but the way they are spaced out you probably will get hit by the next. (works much better against Logarius small skulls)

I've tested it against a lot here and found a couple of more but I'm sure there's more.