Heizou is an Anemo Driver. His role is to stay on field and deal damage while triggering reactions and offering support to his teammates through Swirl and 4pc Viridescent Venerer, if equipped.
Xiangling act as the Main DPS through her Burst, profiting from Bennett's ATK Buff, Heizou's shredding and Xingqiu's Hydro application.
Xingqiu enables Vaporize and deals consistent damage on his own as well.
Bennett's utility consists in providing a huge ATK boost to the team as well as Pyro resonance. He can't really be replaced as his contribute is unique.
Beidou covers the Main DPS role and provides constant Electro application. This team is focussed around maximising Beidou's Electro-Charged DMG.
Kuki Shinobu provides healing and, if equipped, Tenacity of the Millelith buff, as well as extra particles and more Electro application.
Mona is a Hydro applier, she enables Electro-Charged and buffs the team with her Burst's Omen and C1, if owned.
Kokomi provides healing, Hydro application and constant freeze uptime.
Ganyu utility consists in spamming her Off Field Burst to continously apply Cryo and freeze enemies, while dealing noticeable damage.
Diona batteries Ganyu's burst and provides a shield (resistance to interruptions) and extra healing.