Ugo
Ugo was a member of the Venetian Thieves' Guild during the 15th century. After Ezio Auditore da Firenze's arrival, Ugo helped him to bring the wounded Rosa back to the Thieves' Guild, and after that, gave him instructions to free some captured thieves, followed by the order to steal some armor from La Serenissima.
after Ugo sees that Ezio is helping Rosa, he seems to have not taking a liking in him, when he is on the boat, he shouts thing to ezio like hurry up we havn't got all day idiota and when he sets Ezio on a mission to free the thieves, in his dialog after Ezio completes the mission, he sai's i didn' expect you to succeed so quickly even when they have got rosa to safety, when ezio asks him to do something, he doesn't do it, but when rosa asks him to do the same thing he does it first time round, this could mean ugo had feelings for rosa.