Here is a guide about how to decide which Genshin Impact best 4-star Character in Prosperous Partnerships event that you should put in your team.
Genshin Impact Prosperous Partnerships Best Characters
In the Fleeting Colors in Flight, there is an option that players can exchange one 4 star character such as Xingqiu, Yun Jin, Beidou, Xiangling, Ningguang, Xinyan, Yanfei, and Chongyun. In order to obtain one of these characters, players must earn enough Firework Coins and Hydra Boss Coins to redeem the character.
Here is some information on each character that helps you to choose the best character for your team comp.
Xingqiu is a 4-star Hydro character that uses Sword as a weapon. She is one of the best Sub-DPS with Hyrdo elemental burst that deals high Hydro damage which its effects can apply to other characters when your switch. Xingqiu is a good choice when your team needs a Hydro Sub-DPS.
Yun Jin is a 4-star Geo character that uses Polearm as a weapon. Yun Jin has Geo Elemental Skill that deals AoE damage to damage to enemies and all nearby party members as Flying Cloud Flag Formation. She is the best Geo Sub-DPS when your team needs Geo elemental damage as your requirement.
Beidou is a 4 stars Electro character that uses Claymore as a weapon. Besides Razor, we have Beidou who is also Electro Main DPS who has an amazing counter elemental skill that converts enemies damage to output more damage. She has a great elemental burst which can apply electro even you change to another character. So if you need an Electro DPS in your team Beidou will be the best.
Xiangling is a 4 star Pyro character that uses Polearm as a weapon. Xiangling has great elemental reaction skills which appear that she is a Sub-DPS. Even though she is a sub-DPS, she can output some great damage which is possible to build her as DPS. If you need Pyro Support, Xiangling is a great option to go with.
Ningguang is a 4 stars Geo character that uses Catalyst as a weapon. Ningguang is the best 4 star Geo DPS who has a powerful Elemental Burst. Not only deal a ton of damage, but Ningguang also provides an elemental shield. She is a good choice for you to pick if your team needs a Geo DPS character to fill up your team.
Xinyan is another 4-stars Pyro character who uses Claymore as a weapon. If you need a Pyro Main DPS like Diluc, Xinyan is the best option even she is a 4-star character. She can output a ton of damage if you build her as Pyro DPS or Physical Damage similar to Razor. You can build her as a Sub-DPS as well because of her strong shield and her elemental burst.
Yanfei is another 4-star Pyro character who uses Catalyst as a weapon. She is a good Sub-DPS character to fill up your team for Pyro elemental reaction. Yanfei has an Elemental burst that deals AoE Damage and grants her the maximum number of Scarlet Seals that give bonuses to both herself and another character in the team. She is a good choice for you to fill up your team requirement.
Chongyun is a 4-star Cryo character who uses Claymore as a weapon. He has Elemental skill that deals AoE Damage and applies Cryo elemental to opponents in the area. We can use Chongyun as a Sub-DPS that provides Cyro Elemental reaction to fulfill your needs to build your best team comp.
Prosperous Partnerships is an event in Fleeting Colors in Flight that allows players to complete missions to find currencies (Firework Coins and Hydra Boss Coins) to exchange one of the characters above.