Well even though nobody cares about this game anymore, I did a bit of research on invincibility frames I wanted to post here. Basically I counted the amount of invincibility frames every character has when backdashing, doing a quick recovery and during a lineshift recovery. Also I counted the amount of upper body invincibility frames for each character during an AB attack.
Quick recovery invincibility is the same for most characters, but a few have different values:
13: Sokaku
12: Hon-Fu
11: Everyone else
8: Laurence
Things get quite a bit more varied with backdashes
40: Bob (!)
31: Xiangfei
29: Hon-Fu
26: Chonshu
25: Geese
24: Chonrei
23: Joe
20: Kim, Krauser, Franco, Andy, Rick
19: Mary, Sokaku, Cheng, Terry, Tung, Duck, Mai
17: Yamazaki, Billy, Laurence
Lineshift recovery:
35: Franco, Krauser
34: Cheng, Geese, Yamazaki, Laurence, Sokaku, Joe
33: Rick, Terry, Kim, Bob, Billy
32: Andy, Tung, Duck, Hon-Fu
31: Chonrei, Xiangfei, Chonshu, Mai
25: Mary
AB upper body invincibility
13: Mai
12: Duck, Hon-Fu
10: Billy, Rick
9: Joe, Terry, Andy, Krauser
8: Tung, Yamazaki, Laurence, Cheng
7: Sokaku, Kim, Bob, Geese, Chonrei
6: Mary, Xiangfei, Franco
5: Chonshu
Also, every character gets one invincibility frame when coming from the back plane and one after a taunt ends (?), no matter if you cancel it or not. Command grabs are invincible on startup.
Another strange bit of data is that characters have visible get-hit boxes even when they are fully invincible. This is the first time I see something like that. I counted the frames based on a “muteki” (invincible) indicator you can turn on in the dip switch menu.
Coming soon, a full Duck King strategy guide and his whole hitbox set.