Furina

In short: Furina is one of the most versatile supports: she boosts the whole team's damage and deals solid off-field Hydro damage herself. Her damage and buffs scale with Max HP, so HP% goes on sands and goblet. Her main set is Golden Troupe: nearly all of her damage comes from her Skill.

How she plays: in Ousia, her Skill, Salon Solitaire, summons three Salon Members. They deal Hydro damage and take HP from allies above 50% HP: the more "donors", the harder they hit, up to 140%. In Pneuma they're replaced by the Singer of Many Waters, who heals. In combat Ousia is almost always used. Her Burst, Let the People Rejoice, starts Universal Revelry: every change in allies' HP grants Fanfare, and Fanfare increases the whole team's damage and incoming healing.

Why she needs a healer: Fanfare builds from both HP loss and healing, so Furina works best with a strong healer. Without one, the team's HP drops and her buff grows slowly.

Stats: HP 35–40k (her second passive scales up to 40k), Crit Rate 60–80%, Crit DMG 160–200%+, Energy Recharge 180%+.

Partners: she suits almost any DPS. In Freeze she sits next to Skirk, Escoffier and Shenhe; in hypercarry with Neuvillette, Xilonen and Kazuha; in Vaporize with Mavuika and Bennett. Good healers for her are Escoffier, Xilonen, Bennett and Kokomi.

Constellations: C1 gives 150 Fanfare at once and raises its cap. C2 is the strongest: Fanfare builds 250% faster and the excess raises Furina's HP. C6 turns her attacks into Hydro and makes her a full main DPS.

Weaknesses: without a healer she loses most of her buff, and switching Arkhe removes the current summons from the field.