>>677373It's pretty much all straight ahead, no keys. I've come to the conclusion that 99% of all great sakuga is animated straight ahead so I'm just trying to get better at it. Sometimes I add inbetweens if the timing is too fast (the momentum of stuff with secondary motion starts looking fucked when I do that though). Now the fade in there was done last just tracing the first frame.
I learned quite a bit by messing around animating balls moving in non-ball-like ways, a character is pretty much a ball.