Tanjiro, Nezuko, Zenitsu, and Inosuke/Strategy

Strengths

• Have an extremely short 3-turn Dispel in form of  Third Fang: DevourPlain damage to a foe based on 10% of its current HP (Damage cap: 1,000,000) and remove 1 buff.. The skill also deals up to 1,000,000 Plain damage, bypassing foe's elemental resistance, defense and damage cut.
• KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
  greatly improves their offensive capability. It can be quickly generated by casting  First Form: Water Surface Slash500% Water damage to all foes.
  Gain 15% Water ATK Up (Stackable / Max: 60%)Water ATK is boosted (Stackable)
  Strength: 15% (Max: 60%)Duration: Indefinite.
  Raise KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
  Duration: Indefinite lvl by 1.. The skill also grants them Water ATK Up (Stackable)Water ATK is boosted (Stackable)
  that lasts until it's dispelled.
  • Consuming 5 KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
    stacks while dealing charge attack also deals 999,999 Plain damage, which is very appreciated as additional damage source.
• When their HP bar turns redi.e below 25% HP,  First Form: Thunderclap and FlashWhen below 25% HP:
  40% boost to dodge rate.
  Sleeping Zenitsu deals 600% superior elemental damage to a foe at end of turn (Damage cap: ~1,160,000). gives them ability to deal superior elemental damage to foes at the end of each turn, in conjunction of high dodge rate to keep them alive.
• They start the battle with Lethal Attack Dodged (1 time)Can withstand lethal DMG (Leaves 1 HP / Can't be removed)
  , ensuring them to survive any lethal hit once in the battle.

Weaknesses

• Both  First Form: Water Surface Slash500% Water damage to all foes.
  Gain 15% Water ATK Up (Stackable / Max: 60%)Water ATK is boosted (Stackable)
  Strength: 15% (Max: 60%)Duration: Indefinite.
  Raise KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
  Duration: Indefinite lvl by 1. and  Third Fang: DevourPlain damage to a foe based on 10% of its current HP (Damage cap: 1,000,000) and remove 1 buff. are linked skills; these skills can't be cast at the same time without any form of skill cooldown reset (e.g Qilin 3★ call).
•  Third Fang: DevourPlain damage to a foe based on 10% of its current HP (Damage cap: 1,000,000) and remove 1 buff. scales against foe's current HP; once the foe's HP falls below 10 million, the plain damage decays in strength.
• Trading off KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
  stacks for plain damage on charge attack will result in temporary loss of their offensive capability.

Main Character

Characters

• List of Water characters with Katana proficiency for Atma Blade synergy.
• Maria Theresa:  Third Fang: DevourPlain damage to a foe based on 10% of its current HP (Damage cap: 1,000,000) and remove 1 buff. will always activate either  Aurum Sword300% Water damage to all foes when an ally casts a buff-removing skill (Damage cap: ~480,000). Inflict UnrighteousnessATK and DEF are lowered
  Strength: 10% ATK Down / 10% DEF DownBase Accuracy: Guaranteed to land if the foe does not have 100% debuff resistance (10,000% base accuracy)Duration: 3 turnsLocal status effect. or  Justice ReversedWhen Sub Ally: 300% Water damage to all foes when a Water ally casts a buff-removing skill (Damage cap: ~480,000).
  Inflict 10% ATK Down (Stackable / Max: 30%)ATK is lowered (Stackable)
  Strength: 10% (Max: 30%)Base Accuracy: 90%Duration: 180 seconds and 10% DEF Down (Stackable / Max: 30%)DEF is lowered (Stackable)
  Strength: 10% (Max: 30%)Base Accuracy: 90%Duration: 180 seconds., depending on Maria's position in the party. Debuffs offered by both of Maria's support skills will improve team's survivability while also making it easier to cap DEF Down.
• Lucio (Summer): Guaranteed TAGuaranteed triple attack regardless of Triple Attack Lowered debuffs
  and Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks
  from  Without YouGrant a Water ally 90% Bonus Water DMGDeals bonus water DMG for one-foe one-ally attacks
  Strength: 90%Duration: 2 turns, Guaranteed TAGuaranteed triple attack regardless of Triple Attack Lowered debuffs
  Duration: 2 turns, 70% Fire CutFire DMG is cut 70%
  Duration: 2 turnsFire Damage Cut., and 100% Debuff Res. UpDebuff resistance is boosted
  Strength: 100%Duration: 2 turns. pair very well with supplemental damage from KaguraDMG is supplemented and attack specs are boosted based on Kagura lvl (Max: 5 / Can't be removed)
  .