Duelists
Healers
Physical Rear
Magical Rear
AoE Rear
Assist
Anti-Rush
Tanks
Soldiers
Supports
Anti-Swarm
This is the part of the guide this 'army' is built off of. Which is the 'Advanced' setup for 'Veteran' players. Yes, I know that certain units can fill a wide variety of roles and/or go against what their class would traditionally be used for. I had to put each class somewhere though since I never wrote a guide for each specific unit.
4+: Duelists: Bandit, Valkyrie, Princess, Dragon Officer, Avenger, Angel, Dragon Rider, Vampire Princess, Immortal Princess, Puppet User, Vampire Lord, Royal Guard, Hermit, Majin
3-7: Healers: Healer, Priest Warrior, Feng Shui User, Dragon Shaman
2-6: Physical Rear: Archer, Ranger, Pirate, Vampire Hunter, Merchant
2-6: Magical Rear: Witch, Shaman, Chrono Witch, Necromancer, Onmyoji, Druid, Monster User, Dark Priest
2-5: AoE Rear: Mage, Bishop, Cannoneer, Summoner
2-4: Assist: Ninja, Magic Swordsman, Sailor, Bow Rider
2-4: Anti-Rush: Rogue, Monk, Yoko
2-4: Tanks: Heavy Armor, Dragon Warrior, Dark Fighter, Mage Armor
2-3: Soldiers
1-6: Supports: Advance Guard, Rear Guard, Dancer, Maid, Parliamentary Secretary, Alchemist, Thief, Curse User, Enchanter, Merchant
1-4: Anti-Swarm: Samurai, Pegasus Rider, Sword Master
I'm still not totally sure about soldiers. I noticed Katie was being used more in the videos I've watched, but quite a few people argue Aria over Katie. I just ended up widening the soldier roster limit for inclusion of both of them, but I'm pretty sure at no point will you need three soldiers though.
There Premium Units I have access to