*vincent's NOTP, OTP, and BROTP*
There's two answers to every one of these. There is the canon answer concerning his actual story line, then there is the answer that involves those he has interacted with on here.
NOTP: The mad whore Gretchen, once his favorite play pal, now one of his nightmares. OTP: His Mistress Aerix, even though she no longer gives him the slightest bit of the attention he craves from her, he will always pine for her. BROTP: The vampire Murdoch, with all of his Irish-French sass. The two have kept each other company over the years in many ways, and Murdoch is the one Vincent wrote letters to during his exile.
Interactively: (Multiverse)
NOTP: Ultimecia - This bitch. 'Nough said. He can't stand her, and she reminds him of an excessively cocky Gretchen, with extra crazy crackers on the side. OTP: Hjin - This lovely Viera lady welcomed him into her home and put up with his bullshit in the beginning(and by 'put up with', I mean she knocked his ass flat a couple of times). She taught him that he was capable of an emotion that he thought he was born without. BROTP: Cecil - This radio host is so nonchalant about all of the fantastical happenings in his home town that Vincent decides he wants to stay. Dean - This hunter caught Vincent's attention right from the get-go, and he honestly for once in his long life(despite any flirtation attempts that may come) just wants to be best buddies.