My first character was an absolute atrocity. Points put in RES, no idea how to ascend weapons or use magic so I deleted that after getting stuck and quitting DS for about half a year.
My 2nd attempt and first proper character was a heavy hitter/pyro with several weapons including lighting claymore+5, BKGA+5 and a man serpent greatsword+15 and fully upgraded pyro. Finished NG++ at about SL160.
3rd character was a DEX/INT build wrecking shit with my baller' swag sword+15 and tons of wrecking ball sorceries and magic buffs. Finished NG+ at SL125.
Just started another playtrough as a STR/FAITH build. Just joined the warrior of sunlight covenant and am wreaking all kinds of havoc with a +15 Zweihander (jesus this sword is fucking awesome) buffed with sunlight blade. At about SL 75 and busy getting summoned at the Royal Wood, helping people with either Artorias or Kalameet. Fucking Kalameet always gets me though. Probably my vote for hardest boss of the game, right below O&S and Gwyn (I suck at parrying lol).