Nazuna is a lot easier to deal with than Scharl, but its the same general idea:
STAY OUT OF THE SIRLIN YOMI BOXES
You should never be:
Nazuna - Directly in front (5C zone), face level (2B zone)
Sharl - Directly above (2B zone), eye level (5B zone), Directly in front (5C zone)
2B is your main threat against Nazuna, but you can avoid it by coming up and over her with JC, or under it with JB WITH variable speeds. Always change it up.
This will not work against Scharl. 2B stop you from going around and 5B will cover her front. You will need to either throw her off of wait for her to do something bad. Luckily, those moves are not as dangerous as Nazuna's 2B as they are air blockable. So you can home in slowly and fake going above and low. And if you mess up you won't die since you can air block the chains. And of course, after you get in, Kill Them.