Quargan the Crowned is a Spirit affinity epic from the Lizardmen faction. Quargan was added to Raid in February 2021 along with other champions for the Valentine fusion.
Quargan has a support based kit with strong defensive buffs for his team such as shields, and veil & atk buff for attack based champs and block debuffs and def buff for defensive champs. This should mean he can help you direct the damage onto your tanks whilst keeping your attack based champions alive. The A3 skill is nice but I believe he becomes a jack of all trades but master of none and for that reason, I cannot really see a reason to 6star him unless you have few options.

Attacks 1 enemy. Has a 30% chance of increasing the duration of a random buff on random ally by 1 turn.
Level 2: Damage +5%
Level 3: Buff/Debuff Chance +5%
Level 4: Damage +5%
Level 5: Buff/Debuff Chance +5%
Level 6: Buff/Debuff Chance +10%

Heals all allies by 15% of their MAX HP and places a [Shield] buff equal to 15% of their MAX HP on all allies for 2 turns.
Level 2: Heal +5%
Level 3: Shield +5%
Level 4: Heal +10%
Level 5: Shield +10%
Level 6: Cooldown -1

Places a [Perfect Veil] buff and a 50% [Increase ATK] buff for 2 turns on all allies whose ATK is higher than their DEF.

Places a [Block Debuffs] buff for 1 turn and a 60% [Increase DEF] buff for 2 turns on all allies whose DEF is higher than their ATK.
Level 2: Cooldown -1
Level 3: Cooldown -1

PVE Masteries

PVP Masteries