I like both Marina and Octavian, but my favorite of the two is Octavian. He was the original Octopus villager and I managed to get him in the Gamecube game when I was younger since he moved out of my friend's town. The power of nostalgia and his Cranky personality give him the edge over Marina for me, though I do like her house more. I have both of them living in my main town.
Octavian. I've had them all before and Zucker used to be my ultimate dreamie. I just really went off his design once he came to my town. Marina is cute with her little bow and everything but she's too pink for me. Octavian though is just wonderful. He looks so grumpy, but then he has such lovely facial expressions when he's happy. He's so sweet. I would have him back again if I had room, so he may come to my second town