One thing I always assumed was a must for a soubrette was an light "chest register" that reconciles easily into the head in a range most operatice females would consider a high (A=440 or so).
Pretty much the same as a legit musical theatre soprano, no? Julie Andrews type? Since comedy is so necessary for this fach, the voice has a very natural, spoken voice timbre to it.
Coloraturas don't necessarily have that kind of good register negotiation, though many do.
Tako Oda
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