From PS II, Huey, closely followed by Yousis. I am more into pretty faces and *lean*, smooth bodies. I do like some muscle definition, as long as it is not too much, so Yousis also gets my vote, he has just the perfect amount of muscle size.
From PS III, I think all the possible heroes, from all generations, and also Lyle. In fact, that was one of the reasons I could not decide whom to marry in gen 1, since it would not matter, all the descendants would be beautiful, anyway.
I have not really played PS IV, but even so, I think Rudy is very cute and sexy. Being a shorty also adds to his cuteness, somehow. Like a compact pack of hotness.
In Universe/Portable, I think Hyuga is kind of cute, but only before getting to meet Ethan (that navel opening in gis clothes gets bonus points from me). The boss of the rogues with the scar in his forehead has a ver nice body and awesome hairstyle, although he is a beast... And, similar to Rudo's vote, I also like the tall and slightly overweight 17 year old me (used as my main character in Portable), hahahahaha.