My opinion
TOP
Snake: really good KO potential, many of his moves have a really good hitbox (i.e. his up a) can take a quite a beating. able to plant mines on a person. His recovery is good but is not to be used in a rush lest you get trapped under the ring in a stage such as FD, but also allows you to attack your way out of the recovery if needed.
Marth: It's marth people. Excellent reach, a hit with the tip makes you feel really good especially since he ko's at like 75% with his f and up smash. Fairly hard to knock out. Marth users can become a bit predictable.
HIGH
Fox: Very good KO potential Up smash ko's at around 85%. Able to combo his smashes out of a short hop d air for an easy 35 %, Fast, Able to reflect. Can become very predictable as the d air is a widely known combo starter.
Lucario: Is sort of like a mix of the old Marth and mewtwo. Has priority over **** near everything with his a moves. Gets stronger while taking a beating. Very Floaty (advantage and disadvantage, kinda negates the use of short hopping with him) Able to Counter, Deceptively heavy.
MK: Okay reach, Has insanely quick moves, Very easy to combo with, B moves leave an opening after use reccomendation from me is to limit the use of these moves, Killing Potential is very bad his five moves that ko well for him ko at about 115% with the exception of the f smash which ko's at around 95% ( the 5 moves I found to have decent Ko potential for him are the glide slash up b, n air, f smash, and d smash) Easy to knock out
Pit: Reach is disappointnigly short for a blade wielder, can glide, Has a very good up b that can also turn on you (if he's hit while in the air with his up b he can't use it again until he hits the ground), Decent KO potential KO's at 90%,fairly hard to knock out to reflects.
PT: Decent reach on all of there smashes, Versatility good for keeping your opponents on there toes. Ivy and Squirtle have godly Up smashes that Ko at 75% possibly less (Ivysaur's is quite a bit stronger actually Koing at 65%), Charizard's Flamethrower and Rocksmash are great for racking up damage.
Luigi: REALLY INSANE KO potential Koes at about 60% with the up b,F smash is'nt soo bad either koing at around 95%. Also simple to combo with him.
Mid-High
Kirby: Excellent KO potential can KO at 85% can suck in people for an easy ko. Grab Combo for an easy 45% percent or so Down Grab up air down grab up air is how it goes I think I haven't tried it I've only had it used on me.Very easy to KO.
Bowser: KO's at 80% with his smashes. Heavy. Can Bowsercide on the last life killing the opponent first. easy to hit. Fairly decent reach.
Lucas: Great reac. Excellent Ko potential Kos at 65% with u smash but alot of lag after the move makes you an open target. Very easy to edgeguard with his up b. Not heavy=/
OK I'm too tired to keep going my fingers hurt and I got a party to get ready for