Very interesting data. A Kirbycide is most effective if performed when Kirby is P1 and in his normal size.
DK, Link, Samus, C.Falcon, Yoshi, and Jigglypuff cannot recover even if they survive it, in those matchups at least, this guarantees the win if Kirby has >1 stock.
Kirbycide data:
Lower port kirby kills both characters on the same frame.
Higher port kirby gives you 1f to survive.
Big kirby gives you many frames to survive.
Big kirby and higher port is 1 frames.
On 19xx, you play an extra stock if both characters die on the same frame.