4-star characters are much easier to obtain compared to 5-star ones, and their effectiveness is equally remarkable.
6. Xingqiu

Xingqiu has long been regarded as one of the best support characters in Genshin Impact. His elemental skill and burst are extremely useful, providing healing, damage boost, and triggering elemental reactions.
If players also have Hu Tao, congratulations! The Hu Tao - Xingqiu combo is currently one of the strongest in the game. Xingqiu's swords not only heal but also trigger vaporize reactions, dealing high damage.
7. Diona

Diona is a versatile support character beloved by Genshin players for her versatility and effectiveness. She not only provides healing but also creates shields, something that most 4-star characters currently cannot do simultaneously.
Although Diona's shield from the Cat's Tail Tavern may not be as strong as Zhongli's, and her healing from her burst skill may not match Diona's, Diona excels at adapting to different situations. Additionally, she can trigger elemental reactions with her large AoE Cryo field from her burst skill.
8. Rosaria

Rosaria is favored by many Genshin players due to her unique appearance and playstyle. Along with her pleasant gameplay, her good energy recharge ability helps provide energy for the entire team.
Similar to Diona, Rosaria also creates a large Cryo area for elemental reactions. Rosaria is a versatile sub-DPS character if players prefer to use her as a support damage dealer instead of Diona.
9. Beidou

Beidou serves as a solid DPS support option if players prefer not to use Fischl. The leader of the Crux's burst skill creates a counterattack shield, allowing players to deal considerable damage if they prefer a defensive - offensive playstyle.
Using a claymore also makes it easier for players to break shields and mine ores while exploring Teyvat. The Electro element is also quite useful for creating reactions, although it may not deal as much damage as Pyro.
10. Noelle

When it comes to shield creation and defense, Noelle clearly stands out among 4-star characters. Her elemental skill generates a shield, and her attacks with the shield active can help players heal - a major reason why Noelle is a superior support.
However, many players prefer to use Noelle as a main damage dealer because she is incredibly tanky and difficult to defeat. The fact that everyone has the chance to obtain Noelle for free makes her a great choice in the early stages until you find better characters.