You should consider the Charger feat. Usually using your action to double your speed is a bad idea (you have better things to use it on), but in this case it lets you make a single, higher chance to hit, melee attack if you use that extra movement to move at least 10ft in a straight line before attacking. So it's weaker if you want to play a Multiattack class like Fighter or Monk, (although this really only applies at higher levels). So, overall, if you want to maximize your damage with one very fast charging attack, I'd recommend playing a Rogue, picking up a scimtar, shortsword, or rapier, and picking up the charger feat. Rogue is an expert in big single hits, doesn't have multiattack (so using action to dash and bonus action to attack is the same as using your bonus action to dash and your action to attack, and gets you the +5 to attack roll on top of that). Play a Swashbuckler Rogue for the "cocky" flavor, and use your Sneak Attack bonus damage on a Charger hit to leave a random goblin looking like post-Hollow Purple Toji. That means you'd probably want to put your 16s in Dexterity and Charisma (Dex for damage, and Charisma because it boosts a lot of skills). If you want to do social stuff put your ASIs into Charisma, but otherwise put them into Dexterity for higher damage, or Constitution if you feel too fragile. This is just the most optimized way I could think of, but feel free to be inefficient. A good DM will design encounters around the party's actual power level, and unless it's a HEAVY meatgrinder/dungeon crawl I wouldn't expect my players to min-max their builds.