I'm Seraphinox and this is a class guide on Fire Emblem 6: Sealed Sword. To start off, here are some of the basics to the game and this guide.

Str = Strength
Def = Defense
Spd = Speed
Skl = Skill
Res = Resistance
Con = Constitution
Luck = (duh)
Move = Movement
Mag = Magic

Strength=for physical units-how much damage they deal.
Magic=for magic users-how much damage they deal.
Defence=depletes how much damage physical units do.
Speed=how fast you are—if your spd is 4 points higher than your opponents you will attack twice.
Skill=this affects your hit chance.
Resistance=this depletes the damage you take from magic attacks

This is exactly like rock/paper/scissors.

Physical

Sword beats axe
Axe beats lance
Lance beats sword

Where are the bows you ask? Well they are left out of the triangle because they can only be fired at a distance and usually can't be countered against.

Magical
Anima beats light
Light beats dark
Dark beats anima

The staves are left out because they aren't even for attacking. Okay let's get started on the classes.

Lord-Master lord
Primary weapon(s): Sword

How to promote: At the start of Ch:22.
Promotion bonuses: HP +3 Str +2 Skl +2 Spd +2 Def +2 Res +3 Con +2 Mov +1
Weapon after promotion: None
*Good growths overall
*Needed to end chapters
*Gets the good ol' sword of seals

-All loves attacking the lord.
-Restricted to swords.
-Most of the time needs protection.

Cavalier-Paladin
Primary weapons: Sword, Lance

How to promote: Knight's Crest
Promotion bonuses: HP +3 Str +2 Skl +2 Spd +2 Def +2 Res +3 Con +2 Mov +1
Weapon after promotion: Axes

*After promotion has the whole weapon triangle at its fingertips *High movement
-Low caps
-Bad resistance
-Slow in forests and desserts. Can't cross mountains.

Wyvern Rider-Wyvern Lord
Primary weapon: Lance

How to promote: Elysian Whip
Promotion bonuses:(M) HP +5 Str +2 Skl +2 Spd +2 Def +2 Res +1 Con +1 Mov +1
Promotion bonuses:(F) HP +5 Str +2 Skl +2 Spd +2 Def +2 Res +2 Con +1 Mov +1
Weapon after promotion: Swords

*High movement
*Good strength and HP
-Weak against bows and aircalibur and wyrmslayer -No terrain bonuses
-Bad resistance

Pegasus Knight-Falcoknight
Primary weapon: Lance

How to promote: Elysian Whip
Promotion bonuses: HP +6 Str +2 Skl +2 Spd +2 Def +2 Res +2 Con +1 Mov +1
Weapon after promotion: Swords

*High movement
*Good speed and skill
*Triangle attack
-Weak against bows and aircalibur
-No terrain bonuses
-Low hp and defence

Archer-Sniper
Primary weapon: Bow

How to promote: Orion's bolt
Promotion bonuses (M): HP +3 Str +3 Skl +3 Spd +2 Def +2 Res +2 Con +1 Mov +1
Promotion bonuses (F): HP +3 Str +3 Skl +3 Spd +2 Def +2 Res +2 Con +1 Mov +1
Weapon after promotion: None

*No weapon triangle disadvantage
*Can shoot over walls
*Can use ballista
*Good against flying units
-Expensive equipment
-No weapon triangle advantage
-No melee (can't strike up close.)

Nomad-Nomadic Trooper
Primary weapon: Bow

How to promote: Orion's Bolt
Promotion bonuses:(M) HP +6 Str +2 Skl +1 Spd +1 Def +2 Res +4 Con +1 Mov +1
Promotion bonuses:(F) HP +5 Str +2 Skl +2 Spd +2 Def +2 Res +3 Con +1 Mov +1
Weapon after promotion: Swords

*High mobility
*Can go over rivers
*Good against flying units
*Swords after promotion
-No ballista
-Expensive equipment
-Low defence and resistance

Mercenary-Hero
Primary weapon: Sword

How to promote: Hero's Crest
Promotion bonuses: HP +4 Str +2 Skl +1 Spd +2 Def +4 Res +2 Con +1 Mov +1
Weapon after promotion: Axes

*Solid stats
*Versatile
*Good speed and skill
-Low resistance
-Doesn't excel at anything.

Myrmidon-Swordmaster
Primary weapon: Swords

How to promote: Hero's Crest
Promotion bonuses:(M) HP +5 Str +2 Skl +2 Spd +1 Def +3 Res +2 Con +1 Mov +1
Promotion bonuses:(F) HP +4 Str +3 Skl +2 Spd +2 Def +3 Res +2 Con +1 Mov +1
Weapon after promotion: None

*Great speed and skill
*30% critical when promoted
*Exclusive use of wo dao
*One of best classes in the game
-Bad strength (at times)
-Limited to swords
-Not the best caps

Knight-General
Primary weapon: Lance

How to promote: Knight's Crest
Promotion bonuses:(M) HP +4 Str +3 Skl +2 Spd +3 Def +4 Res +3 Con +2 Mov +1
Promotion bonuses:(F) HP +4 Str +4 Skl +2 Spd +4 Def +3 Res +3 Con +1 Mov +1
Weapon after promotion: Axes

*Good defense
*Versatile
-Lowest movement
-Weak against hammer, rapier and armorslayer.

Pirate-Berserker
Primary weapon: Axe

How to promote: Hero's Crest
Promotion bonuses:HP +5 Str +3 Skl +4 Spd +1 Def +3 Res +0 Con +3 Mov +1
Weapon after promotion: None

*Can walk on water
*Balanced stats
*30% critical when promoted
-Limited to axes
-Axes are inaccurate (bad hit %.)

Fighter-Warrior
Primary weapon: Axe

How to promote: Hero's Crest
Promotion bonuses: HP +4 Str +3 Skl +2 Spd +3 Def +4 Res +3 Con +2 Mov +1
Weapon after promotion: Bows

*Good strength
*High hp
-Axes are inaccurate
-Slow

Bandit-Berserker
Primary weapon: Axe

How to promote: Hero's Crest
Promotion bonuses: HP +4 Str +2 Skl +5 Spd +2 Def +3 Res +0 Con +1 Mov +1
Weapon after promotion: None

*Can traverse mountains
*High hp and strength
*30% critical after promotion
-Bad resistance and skill
-Limited to axes
-Axes are inaccurate

Mage-Sage
Primary weapon: Anima

How to promote: Guiding Ring
Promotion bonuses:(M) HP +4 mag +4 Skl +2 Spd +1 Def +2 Res +2 Con +1 Mov +1
Promotion bonuses:(F) HP +3 mag +3 Skl +3 Spd +3 Def +1 Res +2 Con +1 Mov +1
Weapon after promotion: Staves

*Wide spell selection
*Most accurate magic
*Can use staves once promoted
-low Hp and defence

Shaman-Druid
Primary weapon: Dark

How to promote: Guiding Ring
Promotion bonuses:(M) HP +3 mag +4 Skl +2 Spd +2 Def +2 Res +2 Con +1 Mov +1
Promotion bonuses:(F) HP +2 mag +4 Skl +2 Spd +3 Def +2 Res +2 Con +1 Mov +1
Weapon after promotion: Staves

*Strongest magic
*Can use staves after promotion
*Powerful spell selection
-Low hp and defence
-Inaccurate magic

Priest-Bishop
Primary Weapon: Staves

How to promote: Guiding Ring
Promotion bonuses:(M) HP +3 Str +3 Skl +3 Spd +2 Def +2 Res +3 Con +1 Mov +1
Promotion bonuses:(F) HP +3 Str +3 Skl +3 Spd +2 Def +2 Res +3 Con +1 Mov +1
Weapon after promotion: Light

*Supporting unit
*Experience*2 when promoted
-Weak spell selection
-Low hp and defence
-Liability before promotion
-Hard to get experience

Troubadour-Valkyrie
Primary weapon: Staves

How to promote: Guiding ring
Promotion bonuses: HP +4 Str +3 Skl +2 Spd +2 Def +2 Res +3 Con +1 Mov +1
Weapon after promotion: Anima

*High movement
*Versatile supporting unit
*Experience*2 when promoted
-Hard to get experience
-Low hp and defence
-Liability before promotion

Thief-N/A
Primary weapon: Sword
How to promote: N/A
Promotion bonuses: N/A
Weapon after promotion: N/A

*Only unit able to steal.
*Exclusive use of lock pick
*High speed
*Experience*2
-Great bolting fodder
-Weak in everything except speed
-Can't promote

Dancer/Bard-N/A
Primary weapon: N/A
How to promote: N/A
Promotion bonuses: N/A
Weapon after promotion: N/A

*Makes units move again
-Can't attack
-Fragile