Hawk cannot do much more than just fighting in this class.

skill: Back Slash
spells: None

You'll receive some trap spells if you choose this class. Not much other differences from the thief, anyway.

skill: Back Slash, Flying Swallow Toss
spells: Arrow, Spike

If you select this class, you accept that Hawk won't be too good in attacks anymore. This class focuses on a wide variety of spells, but has the lowest attack of ALL classes.

skill: Back Slash, Flying Swallow Toss, Dance of Roses
spells: Arrow, Spike, Body Change, Sleep Flower, Half Vanish, Trans Shape, Life Booster, Aura Wave, Poison Bubble, Counter Magic, Energy Ball, Lunatic
item required for this class change: Good Luck Die

More balanced class than the Wanderer. Less spells than above, but more attack power and the ability to attack enemies no matter the range.

skill: Back Slash, Flying Swallow Toss, Thousand Slice
spells: Arrow, Spike, Body Change, Sleep Flower, Stone Drop, Denrai
item required for this class change: Bad Luck die

He's a bit stronger than the ranger, but lacks the fullscreen attack power. Has some debuff magic.

skill: Back Slash, Silhouette Slice
spells: Shuriken, Earth Jutsu, Thunder Jutsu, Water Jutsu, Fire Jutsu

This is just too stylish. Hawk takes a lot of damages to the enemies, he'll also get loads of Ninjutsu attacks

skill: Back Slash, Silhouette Slice, Split-Image Slice
spells: Shuriken, Earth Jutsu, Thunder Jutsu, Water Jutsu, Fire Jutsu, Poison Breath, Fire Breath, Blow Needles, Deadly Weapon, Black Rain
item required for this class change: Nighteye

Instead of gaining new Ninjutsu attacks, Hawk now can multi-target the existing ones and cause area damage.

skill: Back Slash, Silhouette Slice, Shadow Dive
spells: Shuriken, Earth Jutsu, Thunder Jutsu, Water Jutsu, Fire Jutsu
item required for this class change: Bullseye Die

The final light class that can be obtained after beating the last boss of the game.

skill: Petal Crossfire: Strike after strike of thrown hidden weapons deal lots of damage to enemy.
spells: About Face: Stat decrease effect swapped for stat increase.

The final dark class that can be obtained after beating the last boss of the game.

skill: Shackle Sting: Special chains bind the enemy and a spiritual dagger deals massive damage.
spells: Dark Zone: All enemies’ attack decreased at start of battle.