MapleStory Warrior

The guys who have the most HP and buffs for physical attackers. It is highly recommended for beginners due to their survivability and low Mesos consumption.

At level 30, the warrior can choose between Page, Fighter and Spearman. All of them have of course, their own specialties.

The Page
Type:Defensive/Supportive
Weapon:1-Handed Swords/Blunt Weapons or 2-Handed Swords/Blunt Weapons

Their specialty is surviving blows that usually kill all others, and they can drop the attack & defense of enemies. 

At level 60, the Page becomes a White Knight

White Knights can use ice, fire, lightning, heal themselves by 40%, raise the max level of skills, and their defense becomes even bigger.

The knight of absolute defense, Paladin!

At level 100, the White Knight becomes a Paladin

This is more an "expansion" of the White Knight than a job advancement. Their defense is bigger, they can mob and they have the holy element.

Pros
EXTREME defense (from what I've heard, they can even survive 1/1!)
Have a Hyper Skill that makes them invincible

Cons
Weaker than the other warriors (their defense is DARN too HIGH!)

The Fighter
Type:Offensive
Weapon:2-Handed Axes/Swords

Their speciality is DAmage, DAMAge, DAMAGE!

At level 60, the Fighter becomes a Crusader

They become even stronger, inflict more damage on enemies that are stunned, heal in combat, and can stun enemies!

The warrior who maximizes damage, Hero!

At level 100, the Crusader becomes a Hero

Becomes frightening. They can destroy bosses effortlessly.

Pros
Can ignore 50% of enemy defense
Pure destructive force

Cons
Not very versatile (who cares!? their power is HIGH!)

The Spearman
Weapon:Spear/Pole arm
Type:Offensive/Supportive

They can raise the defense of allies and raise HP & MP by 60%.

At level 60, the Spearman becomes a Dragon Knight (renamed Berserk after the RED update)

High critical rate, can heal by attacking, making them almost immortal, can increase their own STR.

The undying Dark Knight!

At level 100, the Dragon Knight becomes a Dark Knight
Things get serious when Dark Knights enter the house! They can heal faster, get stronger the lower their HP is and they have a summon that counter attack and makes them stronger.

Pros
Almost immortal
Pretty versatile since they're strong and can buff
Heal HP passively
The lower their HP, the stronger they get

Cons
???

Before RED
Character creation
Gameplay (Page, White Knight, Paladin)
Gameplay (Fighter, Crusader, Hero)
Gameplay (Spearman, Dragon Knight, Dark Knight)

After RED
Character creation
Gameplay (Page, White Knight, Paladin)
Gameplay (Fighter, Crusader, Hero)
Gameplay  (Spearman, Dragon Knight, Dark Knight)