I prefer mostly mature and elder girls (Helena, Christie, Tina, Lisa and Sarah) and Ayane as an exception since she isn't about being moe and cutesy like the rest of the younger girls but I also do find Rio in DOAP very likable for me despite her kiddish cheerfulness. Must be the red hair and the wide green eyes. She just reminds me of cherries lol.
As for the guys, Bayman's an ultimate mancrush for me, especially now with all the scars he has. Leon used to be my # 1 (especially when he's in his gladiator costume) but I just wish he had looked more youthful by facial appearance (Bass and Gen-Fu looks even younger than him and they are both 48 and 67 respectively) but of course, I still like him and thankful for his return in DOA5U. Bass' beady eyes are cute for some reason and Eliot is just adorable.