Best Team for Rosaria in Genshin Impact
Team #1: Eula Superconduct
Eula is a Physical Main DPS character who mostly uses her Burst and Normal Attacks to deal damage. In order to maximize Eula's Physical DMG, Superconduct, a Cryo Battery and dedicated supports are needed.
Raiden is a top pick teammate for Eula. She enables Superconduct and provides constant off-field Electro application, batteries the team and acts as a second DPS (Eula+Raiden is also known as "Double DPS team"). Note: Raiden is forced into an ATK goblet build in this team, as she isn't getting any external ATK buff.
Xinyan works as a Sub DPS and shielder and provides Physical resistance shred through her shield and her C4, if owned. Xinyan's burst also gets a DPS Bonus in this team. This flexible slot can also host a Crowd Control character, such as Venti.
Team #2: Rosaria National
Team #3: Shinra Tensei (Ayaka Freeze)
Ayaka takes advantage from the Freeze reaction, Cryo resonance and 4pc Blizzard Strayer to gain 55% Crit Rate. She is the main damage dealer and her numbers get furtherly increased by Cryo swirl and her own passive talents. Note: Bosses can't be frozen, so this team is not effective against them.
Kokomi applies Hydro consistently enough to trigger Freeze and heals the team. If equipped with 4pc Ocean Hued Clam, she deals considerable damage as well.