Ok I'll go ahead and do this based on looks personality and lulz because those are basically the most important things to any character:
Hisao:
Looks (8/10, dat sweater vest)
Personality (7/10, I feel he was a little too influenced by the girls so he was a little all over the place plus at times like when choosing
whether to sex up Misha or not I kinda disliked the way that he was interpreting events, yeah it was a choice but he's the one who presented that choice, also a little too mopey at the begining for me, whether it was justified or not)
Lulz (9/10, Hisao's narration was one of the funniest parts of the game especially when associated with Kenji, like his realization that today would not be a good day when seeing his face)
Total: 24/30 Hisao is a very good character I liked him except for a few points
Kenji:
Looks (7/10, he's alright and all but nothing really special beyond some cool clothes and interesting eyes)
Personality (10/10, the best friend you could possibly have I would look forward immensely to any conversation involving Kenji and he would just be the best bro ever)
Lulz (10/10, definetly one of if not THE funiest character in the game Kenji is classic)
Total: 27/30 loses points for not being the best looking but really is by far one of the best characters in the game
Misha:
Looks (8/10, dem drills, though while I'm sure she's perfectly normal she looks like she might be a little rotund)
Personality (9/10, she isn't the smartest but that doesn't stop her from being someone who'd be a great friend and fun to be with)
Lulz (8/10, she got a little old at times but she still had some great moments like when she was "broken")
Total: 25/30 One of the better characters in the game, to bad there wasnt a route for her, or a Shizune/Misha route
Emi:
Looks (6/10, I've got nothing against her lack of legs, but she looks way too young for me as a starter, I'm not a fan of the pigtails and the rest of her is more or less plain, sooo)
Personality (5/10, Good lord she could get on my nerves at times, only at 5 rather than lower because she could have a couple moments with the nurse and wanting to be a pirate, but she was also quite annoying and at times when she was being a total prick to Hisao for his wanting to help her I wanted to give her a good whack)
Lulz (5/10, had a few moments, but they were a little few and far inbetween)
Total: 16/30 It should be obvious that she is one of my least favorite characters in the game
Lilly:
Looks (9/10, Lilly looks very nice... well basically all the time)
Personality (7/10, Lilly is an interesting one, she's not too serious, not too crazy or really anything definitive she has a little of it all and that makes her interesting to me, points off for randomly ragging on Shizune from time to time, I mean Shizune always says it to her face or tells Hisao to ask Lilly as she doesnt want to be biased (sometimes) but Lilly can sometimes (though I dont remember specific examples) just hear about Shizune and start talking smack)
Lulz (6/10, has some funny moments but then she's not a funny person for the most part, though she still managed to crack me up with little things like
her healthy adolescet sex drive)
Total: 22/30 Despite the lower score I do like Lilly a decent amount, just not as much as some of the others
Rin:
Looks (8/10 looks a little like a guy but not too much so it's not that bad, my attention is always brought to her arms but then she has some of the cutest faces too)
Personality (9/10, much like Kenji, I would absolutely love hanging out with Rin and just talking about whatever, it would be fun and my day would be a little brighter)
Lulz (10/10, Rin is one of the funniest parts of KS, just her complete "out there"-ness and actions are very funny, like walking down the street wit Lilly when suddenly a wild Rin appears looking at the sky for apparently hours)
Total: 27/30 Another of my more favorite characters in the game
Hanako
Looks (9/10 burns notwithstanding Hanako is really a very cute girl)
Personality (8/10 A little too reserved at time but that can also be very endearing, though such a high level of social anxiety would likely get annoying)
Lulz (5/10, has her moments as well but not a whole lot of them as she was never really meant to be much of a funny character)
Total: 22/30 Not my favorite character but not that bad either
Shizune:
Looks (10/10, damn son Shizune is fiiiiine XD)
Personality (9/10, her personality would be great fun most of the time I think the only real problem I might have with her is her whole seeing events as only blocked off things or whatever the explantion was that she doesnt always see how things can carry on like they did with Misha)
Lulz (9/10, while she wasn't a Kenji or a Rin Shizune was without a doubt very funny, losing bonus points for not saving Hideaki, I'll devour you, etc)
Total: 28/30 I wonder if Shizune could possibly be my favorite character? Hmmm maybe
Jigoro:
Looks (9/10 Aww yeah man, look at that mane, that beard and that sword, Jigoro is like emenating manliness or something, and that shirt, it oozes confidence)
Personality (4/10, Jigoro's main weakpoint is that he's such a jerk ass, I mean it's hilarious dont get me wrong, but laughing at him is liable to get me killed so I'd likely just get annoyed with him at some point)
Lulz (10/10, so many lulz, so many lulz to be had from Jigoro's many conversations or actions, like that omelet he made for Hisao which was undoubtedly just him smashing whole eggs onto a frying pan and saying "Ta f****ing dah, an omelet" or something like that XD)
Total: 23/30, a great character to be sure, but loses out on his complete abraisevness
Yuuko
Looks (6/10 Meh she's plain what do you want me to say)
Personality (7/10 almost as reserved as Hanako but nowhere near as endearing, has some wise moments though)
Lulz (5/10, some lulz to be had, but more often than not she's just bumbling around)
Total: 18/20 not that great a character in my opinion, but she serves her purpose well enough I suppose
Akira
Looks (8/10, I'm a firm believer that suits look good on both women and men and Akira just proves it more so)
Personality (8/10, She seems like a cool cat and someone who would be fun to hang around with but can also get serious when she needs to as shown in Lily's route)
Lulz (8/10, while she wasn't around often enough to qualify for much higher Akira was definetly an asset to the game when she was "Akira is in the house!")
Total: 24/30 She's not outstanding in any one regard she's just cool overall and seems like a fun type
There, I think that's everyone who matters