You can never tell. I know that even the most serious or professional of seiyuus can really fall apart with comedy series like Gintama. (During several of Wakamoto's scenes with Ishida I kept on imagining Ishida thinking "MUST...RETAIN...STRAIGHT...PERFORMANCE!")
That sounds like a rather tough situation to be in. Sorry that I can't offer any advice with that really.
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That sounds like a rather tough situation to be in. Sorry that I can't offer any advice with that really.