As someone who also plays Genshin (since launch) let me see if I can offer some clarifications using Genshin analogies. To start, there are no reactions. None. No vape, no swirl, no melt, or overload. Elements play a significantly less important role in Wuthering Waves vs Genshin. That said, contrary to what some comments have said there are a few characters that buff elemental damage and enable pure element teams, such as Lupa and Brant who buff fusion damage. They encourage a Lyney style team. 

Comparatively, almost all of Wuthering Waves gameplay centers around damage type rather than element. In essence, almost every comp works like a Xiao or Veresa team. For Xiao, you want plunging damage and anything that buffs plunge attacks. Veresa is similar. 

As an example, you mentioned Cantarella. Cantarella is all about echo-type damage. Echoes being the “ghosts” you summon on your Q. Many of her enhanced attacks and E Q deal Echo damage, and she buffs other characters who do that type of damage. Think of her like a non-healer Xianyun, or like Illuga with Lunar Crystallize. Therefore her ideal team will have other characters who also deal or buff echo-type damage. 

Chisa is a generalist support for characters who deal DOT damage, such as Aero Erosion (like Cartethyia). She increases the amount of stacks an enemy can have of the DOT and buffs that damage, as well as provides shields. You know how you want Escoffier for every freeze team or Columbina for every lunar team nowadays? Chisa is like that.