Hi again!
I feel a bit embarrased because I hadn't seen your sprite tests yet. I have used the DKC one and is great. I have seen the Puftup sprites and it lacks the dead and the swollen sprites. Then, the first idea of rare may be an immortal enemy (like Clambo) and the idea of making it a blowfish may be later than its creation. I guess I should hack the ROM, add puftups and try to kill them with Enguarde. However, I don't find the Hex code for Puftup in your file. In "DKC Palette locations.txt" I see its palette is BC8B0C but I'd like to know the Hex code for the whole enemy. I remember when I hacked DKC in 2007 I downloaded (in the missing Giangurgolo website) a TXT file with almost every HEX code for almost every object in the game. Then, I changed:
1. The "Enguarde crate" code for "Green Kritter" code
2. The "Chomps Jr." code for "Rock Krock" code
3. The "red balloon" code for "Enguarde crate" code
4. The "Chomps" code for "Klump" code.
...and many more (all codes had 4 digits. Digits could be both letters and numbers). As a result, I got this hack:
https://www.youtube.com/watch?v=FLDkvQ_JuXYI'd like to do the same changing "Bitesize" code (for example) with "Puftup" code and try to kill them with Enguarde, but I don't know how to do that with the data you show in your Sprite viewer ZIP file.
In any case, best regards. It's a pleasure to be here again!!