Godzilla and Rodan are bouba. King Ghidorah and Mothra are kiki.
Mecha are kiki. Studio Ghibli movies are bouba. I think.
Not sure of these. Low Japan literacy.
Newtonian mechanics is kiki, Hamiltonian mechanics is bouba. Lagrangian can be either, depending on problem.
Special relativity is kiki, general relativity is bouba