Breakdown of hotto koohii o kudasai.
をo
direct object particle
コーヒーkoohii
coffee
くださいkudasai
please
ホットhotto
hot
ホット is neither an い-adjective nor a な-adjective. It's a noun.
When used to describe a hot drink like coffee, ホット コーヒー, it functions more like a noun as part of a compound noun.
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