Easy question will find an easy answer - Abyss Walker.
The Abyss Walker doesn't need any gear at all to be a pker, no grade dagger or even newbie dagger, which you obtained by joining the game, could be easily used in this case. Because you have mighty blows and its damage is technique, not by a dagger. Abyss Walker has quite good speed run himself, so If you count in some haste potion, your victims won't run away so easily. I'd not prefer a mage for pking, magic's damage instability causes some problems sometimes, you know... And you are also easy target for all kinds of archers, well who knows... :)