I figured I'd compile all the usable skips I know for NGB in place.

https://www.youtube.com/playlist?list=PLSZULrIncYEpGRATuV_E5VLDF7xNCTVua&disable_polymer=true

Chapter 2 River skip Normal X then Y will give u the distance to over the river. If the mage tries to melee you, just dodgeroll. Attempting to use shurikens can make him teleport and immediately cast a spell.

Chapter 9 Warehouse safe skip Point Ryu to the left corner of the platform. Jump and do a late X followed by shuriken+helmsplitter.

Chapter 9 Warehouse yolo skip This skip is very touchy on Ryu's angle into the wall.

Chapter 10 Yolo jump Press Y just as Ryu passes by the overhang and he'll hop onto the next platform.

Chapter 12 Stadium Kyoiri skip On the first jump, be sure to hit the middle of the first wall. Do not jump until you nearly collide with the second wall. On the second wall, do not jump until the final step of the wall run animation. Finally do a shuriken toss and after the second shuriken is tossed (peak height), press Y for helmsplitter. Use a dodge roll to redirect Ryu safely without running off the platform.

Chapter 12 Shimmy skip up Just watch out for the steam. Jump X then shuriken+helmsplitter.

Chapter 12 Lava wallrun to muramasa Need to be very close to the edge and aimed just after the the corner of the two walls.

Chapter 12 Lava double wallrun up Jump onto the middle of the first wall and do a walljump when you reach the second wall. Mash A until the second jump executes and Ryu will clip up onto the platform.

Chapter 12 shimmy skip down Just watch out for the steam. Jump X then shuriken+helmsplitter.

Chapter 12 Seesaw Trick Saves about 2 seconds and eliminates the possibility of damage to the bats. What's the deal with Chapter 12 having all of these?

Chapter 16 Dark Dragon Blade jump Careful on the first jump, you could accidentally toss Ryu into the lava.
The wallruns need to feel a bit long in longer than normal in order for Ryu to reach the final platform. Then shuriken+helmsplitter.