While these characters certainly aren't the strongest, they will happily fill the gaps in your team build.
(4*, Cryo, DPS, Claymore)
Dashing across the water is merely a neat trick that allows Chongyun to travel to unexplored areas, but it’s the Cryo shared attack that makes him great. When you activate Chongyun’s skill, Spirit Blade, all melee attacks are then converted to Cryo element attacks. This allows you to quickly set up elemental reactions with characters and boosts their damage into high numbers.
(4*, Hydro, Healer, Catalyst)
A Hydro-healing wonder, Barbara may not deliver on the damage, but she can pair with other Genshin Impact characters to boost her abilities. Her basic attacks do water splash attacks that can take down Pyro enemy shields quickly, but her charged attack can generate four times the amount of healing power.
(4*, Electro, DPS, Claymore)
Razor has a wolf spirit within, summoned by his Elemental Burst, who helps him create a barrage of Electro-based attacks. This high DPS comes with a cost, however, as it vanishes upon switching characters. That being said, Razor can dish out significant damage all by himself with his Burst and proper use of his skill which boosts his energy recharge and recovery.
(4*, Electro, DPS/Support, Claymore)
Even though Beidou’s skill, Tidecaller, can do a significant amount of Electro damage, she is unable to move during its execution, which leaves her open to attack. Her Burst, however, provides a good offensive attack that deals Electro damage while also reducing incoming damage. She also so happens to be an excellent swimmer and can reduce Stamina costs during swimming by 20%.
(4*, Cryo, Support, Sword)
Keeping enemies frozen is a good benefit to a supporting character like Kaeya, but his skill, Frostgnaw, has a limited distance to its effect. In almost a polar opposite to Xiangling’s fiery swirls, Kaeya can create a rotating belt of ice that revolves around him and does Cryo damage to anyone unlucky enough to be in the way. The Burst persists after switching characters, so it’s great to set up some elemental combos with.
(4*, Cryo, Sub-DPS, Polearm)
Rosaria has a polearm that she uses to do Cryo damage with and she can move faster at night. Her elemental skill, Ravaging Confession, will let her warp behind an enemy and attack them, which will increase her CRIT rate will increase if you manage to attack the foe’s back. Rites of Termination is Rosaria’s Burst ability, and it allows her to summon a gigantic ice lance that deals Cryo damage to enemies, including an AoE that does additional damage to enemies in that area.
(4*, Geo, DPS, Catalyst)
Useful for more than just giving you some constant Geo damage, her Jade Screen is the most effective for dishing out and protecting from damage. Jade Screen is an elemental skill that can both protect from projectiles and deal AoE Geo damage, creating a versatile use case for most parties.
(5*, Electro, DPS, Sword)
The critical damage attacks that you can build with Keqing is the sole reason she works so well. Her single target charged attack creates staggering amounts of damage, plus both her skill and Burst ability can provide Electro AoE damage that combines multiple attacks for some hefty blows.
(4*, Electro, Support, Bow)
Pairing hard-hitting Electro damage with her raven, Oz, Fischl is a strong adventurer who loves supporting other characters as much as she loves lace. While her regular and charged attacks do a significant amount of ranged damage, when she unleashes Oz upon enemies, it provides some localized AoE damage that will boost any barrage. Fischl’s Burst can be used to quickly move Oz to another location so you can swap and add an Electro boost to other character’s DPS.
(4*, Geo, DPS/Healer, Claymore)
Noelle’s shield is easily one of her best features, which allows not only constant damage defense when active, but it automatically triggers if another active character drops below 30% HP. Her Elemental Burst can be used to turn her normal attacks to spread out to wider Geo damage.
(4*, Pyro, DPS, Catalyst)
Yanfei can quickly chip away at enemy's HP with her Pyro DoT and that can result in constant DPS over long periods of time. With great AoE in her kit, Yanfei can be a pretty good unit if you're lacking some AoE damage.