This Soul-level 122 build focuses on speed and evasion. Here are the stats:

Dexterity: 45
Endurance: 48
Vitality: 45
Strength: 20

Putting 20 into your STR stat will let you wield a fair amount of Dark Souls' weapons, effectively giving you a few extra choices for this build. You'll want to wield something like the Balder Side Sword or the Uchigatana (which also provides good bleed damage). Alternatively, you could also wield Great Scythe, which surprisingly very powerful for DEX builds.

If you want to go ranged, choose either the Longbow or the Black Bow of Pharis.

Since Dexterity doesn't necessarily affect armor, you can theoretically where whatever armor you like as long as you can roll quickly and have enough STR. However, to be fast and light while also having a good defense rating, equip the Elite Knight Armor, Elite Knights Gauntlets, Chain Helm, and Chain Leggings. All of these give you good poise to weight ratios. Alternatively, you could swap some of these light armor pieces out for medium armor pieces if you increase END and STR or wear Havel's Ring.

Use the Grass Crest Shield to take advantage of its Stamina regen, which works whether you're wielding it or if it's on your back.