Changed the title so it's a little more clear what you need help with.
If you block Fukua's jHK while you're in the air, when you touch the ground you instantly recover and you aren't blocking any more. This is called 'Land Canceling'
Video Example:
From there, if she tries it again you can sLP to interrupt her out of another one, or call an assist to counter hit her if she tries it again.
If you're getting hit with jHK in neutral, the same thing applies, try and jump and block it in the air so that when you touch the floor you recover in time so you can hit her.
If you don't, that's fine, just pushblock her out by pressing PP while blocking and go back to neutral.
You can also back up away from her so that it misses, or run under her, general footsies stuff.
Any time Brass H is called, you can call your own assist second to 'Counter Call' that assist and punish it without putting yourself at risk.
Just make sure to protect your assist after.
If Brass H gives you a lot of trouble, you can also snap Big Band in and kill him first, and then Fukua second.
You can snap Big Band in by doing



or


depending on if he's Assist 1 or Assist 2.