Here is a list of the Available characters and there advantages/disadvantages/differences:
Mage - The Mage is the most expensive character to equip and uses a Staff for attack and a Robe for defense. As it casts spells it has the most probability of a double hit, particularly if you are struck near the top of the staff. There attack is less powerful below the spell.
Guardian - A Guardian uses a Sword for attack and a shield for defense, and is moderately expensive to equip. They have the fastest attack speed out of all the free characters, and a reasonable chance at a double hit. They do however have a smaller attack reach.
Dwarf - The Dwarf is one of the cheapest characters to equip using an Axe for attack and a shield for defense. It has one of the largest attack ranges of any character, but a low chance of a double hit.
Warrior - The Warrior is the cheapest character to equip, and uses an Axe for attack and a Brace for defense. Warriors can sometimes land double hits as they use a smaller axe than the Dwarf.
Knight - The Knight is an all round balanced character, with moderately priced equipment, using a Sword for attack and a Shield for defense. It has a reasonable chance of landing a double hit, but less than the Mage or Guardian. It also has a reasonable attack range.
Orc - The Orc can be purchased as a special character (PM me for the details). It uses a Sword for Attack and a Brace for Defense, so it is quite cheap to purchase items for. Recently in the latest version of premier, the attack speed for the Orc was increased to faster than the Guardian, in the Arena and Forest only.
Reaper - The Reaper can be purchased as a special character (PM me for the details). Recently in the latest version of premier, the attack speed for the Reaper was increased to faster than the Guardian and Orc, in the Arena and Forest only. It also has a larger attack range than most players but a low chance of a double hit. It can purchase Swords and Shields, although it is holding a Scithe and an hourglass. It was never meant to be played other than by admin, but an overwhelming number of requests lead me to release it as a player the people could purchase. It is possibly the coolest looking and rarest character in the game.