This would be so useful because onomatopeas differ from language to language, and I read mostly french, Japanese and Korean comics so I have NO IDEA what the English equivalents usually are.
I think useful categories would be like:
- animal sounds
- elemental sounds (rain on different surfaces, thunder, wind, storms, fire, etc)
- general character foly (footsteps on different surfaces, clothes textures crinckling or squeeking like leather or raincoat material, also human noises like coughing, gasping, breathing heavily, whistling...)
- interior foly (doors squeeking, home care sounds like vacuum cleaners, dusting, hammering nails into walls, creeking floorboards, water and steam pipes settling...)
- exterior foly (trees rustling, city soundcapes, sea waves...)
- fight sounds (a load of sounds used for impact during fight scenes because you can only use "pow" so many times)
I kind of improvise with mine so there's a load of "FTOM"s for punching, some "clang"s, a lot of "wheeze"s, and a couple of "froosh"s because I didn't know how to make the sound of someone sitting on a bed with one of those crinckly sleeping bags on it.