Pavo is a party guest met at Villa Lucens and regularly drinks with Livius. After Livius' death during the Death on the Isle quest, Pavo is one of the suspects to the murder, and is pickpocketed to obtain a drinking flask.
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Trivia
Pavo is exclusively referred to with they/them pronouns during the quest, and the writer of Death on the Isle, Mod Other, has created multiple other non-binary characters, suggesting that Pavo too is non-binary.