Huzzah. I can comment on both xD
First, for both, a good personality. I don't want to spend a good portion of my time with someone who has a pretty face, but treats me like shit. It's not worth it.
PERSONALITY > LOOKS
A 'good' personality is someone who can handle my specific brand of craziness. Someone who can have conversations about extremely random (and often times gross) things. WHO CAN HOLD A SEMI INTELLIGENT CONVERSATION FOR MORE THAN 5 MINUTES WITHOUT GETTING DISTRACTED BY SOMETHING SHINY. Who isn't embarrassed easily. Who doesn't mind making a fool of themselves in public just for shits and giggles. Someone who doesn't mind ME making a fool of myself in public for shits and giggles. Someone who doesn't have an aversion to getting dirty once in a while (and I mean that literally...bring on the mud wrestling and paint ball wars). Someone who isn't a complete emotional retard (as in, neither a big MACHO I'm-not-allowed-to-feel-anything kind of person, or the kind of person that cries when a flower gets stepped on or when Bambi's mum dies...I know it's a bit to ask for, but basically, someone who can let their feelings show, but not let everything get to them). Someone who can put up with my liking of cuddles.
Physically, I like guys that have pale skin (not averse to dark skin, it just makes me feel even paler than I am...at least if they are lily white too I don't feel so odd...I guess that's what I get for having red hair xD), dark hair (black of dark brunette), green eyes, NOT UBER MUSCLED! there is nothing LESS comfortable than trying to cuddle up to a brick wall. A little bit of cushion can be a good thing (especially when it comes to more intimate situations. Bruising down there fucking hurts!!!) I like toned guys well enough, as much as the next hormonal adolescent, it's just when they start to feel like they are made of steel that it gets a bit much. Um...I guess the sterotype guy that I like would be a metal head. But I really don't care about labels. I've been labelled that many times that I have my own box labelled 'Tripped out-gothic-hippy-tom boy-metal head-nerd'.
Physically in girls, I look for bodies that don't turn invisible when they turn sideways. I hate looking at a girl and thinking 'I shouldn't breath in her direction, she'll break in half'. CURVES! For the love of all that is good in the world CURVES!. If I wanted to date a woman with the body of a ten year old boy, I would just find myself a 10 year old boy FFS. One thing that will turn me off a girl is if she dressed like A) a Barbie doll or B) like a hooker on Thursday night. Not that keen on blondes. Darker hair is alot prettier. HUGE BOOBS are out. I don't wanna get knocked out by them. Medium sized is fine. Once my hands are full the rest just goes to waste anyway.
EDIT: FYI I'm a girl ^.^